diff --git a/Vridhi_Palindrome_q13.c b/Vridhi_Palindrome_q13.c
new file mode 100644
index 0000000..58aca95
--- /dev/null
+++ b/Vridhi_Palindrome_q13.c
@@ -0,0 +1,17 @@
+#include <stdio.h>
+int main(){
+    int n, reverse = 0,dig,original;
+    scanf("%d",&n);
+    original = n;
+    while(n>0){
+        dig = n % 10;
+        reverse = (reverse * 10) + dig;
+        n = (int)(n / 10);
+    }
+    printf("%d\n",reverse);
+    if(original == reverse){
+        printf("Palindrome");
+    }else{
+        printf("Not a Palindrome");
+    }
+}
\ No newline at end of file
diff --git a/Vridhi_Palindrome_q13.exe b/Vridhi_Palindrome_q13.exe
new file mode 100644
index 0000000..d601047
Binary files /dev/null and b/Vridhi_Palindrome_q13.exe differ
diff --git a/Vridhi_Palindrome_q13.py b/Vridhi_Palindrome_q13.py
new file mode 100644
index 0000000..6feb71e
--- /dev/null
+++ b/Vridhi_Palindrome_q13.py
@@ -0,0 +1,4 @@
+n = int(input("n:"))
+m = str(n)
+reverse = int(m[::-1])
+print("Palindrome") if n == reverse else print("Not a Palindrome")
diff --git a/Vridhi_evenorodd_q2.c b/Vridhi_evenorodd_q2.c
new file mode 100644
index 0000000..1cd43b8
--- /dev/null
+++ b/Vridhi_evenorodd_q2.c
@@ -0,0 +1,7 @@
+#include<stdio.h>
+int main(){
+    int n;
+    scanf("%d",&n);
+    n % 2==0? printf("Even") : printf("Odd");
+    return 0;
+}
\ No newline at end of file
diff --git a/Vridhi_evenorodd_q2.exe b/Vridhi_evenorodd_q2.exe
new file mode 100644
index 0000000..af41031
Binary files /dev/null and b/Vridhi_evenorodd_q2.exe differ
diff --git a/Vridhi_evenorodd_q2.py b/Vridhi_evenorodd_q2.py
new file mode 100644
index 0000000..906c9ab
--- /dev/null
+++ b/Vridhi_evenorodd_q2.py
@@ -0,0 +1,3 @@
+n = int(input("enter to check whether n is odd or even: "))
+oddoreven = "Odd" if n%2 !=0 else "Even"
+print(oddoreven)
\ No newline at end of file
diff --git a/Vridhi_greatestofthree_q7.c b/Vridhi_greatestofthree_q7.c
new file mode 100644
index 0000000..c575e2b
--- /dev/null
+++ b/Vridhi_greatestofthree_q7.c
@@ -0,0 +1,7 @@
+#include <stdio.h>
+int main(){
+    int m ,n, o;
+    scanf("%d %d %d", &m,&n,&o);
+    (m > n) && (m > o)? printf("%d",m) : (n > o) && (n > m)? printf("%d",n) :printf("%d", o);
+    return 0;
+}
\ No newline at end of file
diff --git a/Vridhi_greatestofthree_q7.exe b/Vridhi_greatestofthree_q7.exe
new file mode 100644
index 0000000..fd57786
Binary files /dev/null and b/Vridhi_greatestofthree_q7.exe differ
diff --git a/Vridhi_greatestofthree_q7.py b/Vridhi_greatestofthree_q7.py
new file mode 100644
index 0000000..132525f
--- /dev/null
+++ b/Vridhi_greatestofthree_q7.py
@@ -0,0 +1,9 @@
+n = int(input("First number : "))
+m = int(input("second number : "))
+o = int(input("third number : "))
+if (n > o) and (n > m):
+    print(n)
+elif (m > o) and (m > n):
+    print(m)
+else:
+    print(o)
\ No newline at end of file
diff --git a/Vridhi_greatestoftwo_q6.c b/Vridhi_greatestoftwo_q6.c
new file mode 100644
index 0000000..9806739
--- /dev/null
+++ b/Vridhi_greatestoftwo_q6.c
@@ -0,0 +1,6 @@
+#include<stdio.h>
+int main(){
+    int n,m;
+    scanf("%d %d",&n,&m);
+    n>m? printf("%d",n) : printf("%d",m);
+}
\ No newline at end of file
diff --git a/Vridhi_greatestoftwo_q6.exe b/Vridhi_greatestoftwo_q6.exe
new file mode 100644
index 0000000..662144f
Binary files /dev/null and b/Vridhi_greatestoftwo_q6.exe differ
diff --git a/Vridhi_greatestoftwo_q6.py b/Vridhi_greatestoftwo_q6.py
new file mode 100644
index 0000000..8858fb0
--- /dev/null
+++ b/Vridhi_greatestoftwo_q6.py
@@ -0,0 +1,4 @@
+n = int(input("First number: "))
+m = int(input("Second number: "))
+greater = m if m > n else n
+print(greater)
\ No newline at end of file
diff --git a/Vridhi_leapyear_q8.c b/Vridhi_leapyear_q8.c
new file mode 100644
index 0000000..aed3dd3
--- /dev/null
+++ b/Vridhi_leapyear_q8.c
@@ -0,0 +1,16 @@
+#include <stdio.h>
+int main(){
+    int year;
+    scanf("%d", &year);
+    if(year % 100==0){
+        if(year%400 ==0){
+            printf("%d is a leap year",year);
+        }else{
+            printf("%d is a not a leap year",year);
+        }
+    }else if(year%4 == 0){
+        printf("%d is a leap year", year);
+    }else{
+        printf("%d is a not a leap year");
+    }
+}
\ No newline at end of file
diff --git a/Vridhi_leapyear_q8.exe b/Vridhi_leapyear_q8.exe
new file mode 100644
index 0000000..8c07ba3
Binary files /dev/null and b/Vridhi_leapyear_q8.exe differ
diff --git a/Vridhi_leapyear_q8.py b/Vridhi_leapyear_q8.py
new file mode 100644
index 0000000..ef17b3a
--- /dev/null
+++ b/Vridhi_leapyear_q8.py
@@ -0,0 +1,9 @@
+year = int(input("Write year to check: "))
+if year % 100 ==0:
+    if year % 400==0:
+        print(year, "is a leap year")
+    else:
+        print("Not a leap year")
+else:
+    if year % 4 ==0:
+        print(year, "is a leap year")
\ No newline at end of file
diff --git a/Vridhi_positiveornegative_q1.c b/Vridhi_positiveornegative_q1.c
new file mode 100644
index 0000000..5a04aba
--- /dev/null
+++ b/Vridhi_positiveornegative_q1.c
@@ -0,0 +1,7 @@
+#include<stdio.h>
+int main(){
+    int n;
+    scanf("%d",&n);
+    n >= 0? printf("Positive") : printf("Negative");
+    return 0;
+}
\ No newline at end of file
diff --git a/Vridhi_positiveornegative_q1.exe b/Vridhi_positiveornegative_q1.exe
new file mode 100644
index 0000000..46109cc
Binary files /dev/null and b/Vridhi_positiveornegative_q1.exe differ
diff --git a/Vridhi_positiveornegative_q1.py b/Vridhi_positiveornegative_q1.py
new file mode 100644
index 0000000..936389b
--- /dev/null
+++ b/Vridhi_positiveornegative_q1.py
@@ -0,0 +1,3 @@
+n = int(input("Put number to check: "))
+result = "Positive" if n >=0 else "Negative"
+print(result)
\ No newline at end of file
diff --git a/Vridhi_primeinrange_q10.c b/Vridhi_primeinrange_q10.c
new file mode 100644
index 0000000..8b73fae
--- /dev/null
+++ b/Vridhi_primeinrange_q10.c
@@ -0,0 +1,23 @@
+#include <stdio.h>
+int main(){
+    int m,n;
+    scanf("%d %d",&m,&n);
+    for(int i = m ; i<=n ; i++ ){
+        int flag = 0;
+        if (i<=1)
+            continue;
+        
+        for(int j = 2 ; j <= i ;j++){
+            if(i % j == 0){
+                flag = 1;
+                break;
+            }
+        
+        }
+        if(flag == 0){
+        printf("%d",i);
+    }
+    }
+    
+}
+
diff --git a/Vridhi_primeinrange_q10.exe b/Vridhi_primeinrange_q10.exe
new file mode 100644
index 0000000..f2e2157
Binary files /dev/null and b/Vridhi_primeinrange_q10.exe differ
diff --git a/Vridhi_primeinrange_q10.py b/Vridhi_primeinrange_q10.py
new file mode 100644
index 0000000..3a36e79
--- /dev/null
+++ b/Vridhi_primeinrange_q10.py
@@ -0,0 +1,9 @@
+low = int(input("range starts from: "))
+high = int(input("range ends upto: "))
+
+for i in range(low,high +1):
+    for j in range(2,i):
+        if i % j != 0:
+            print(i, end="")
+        break
+        
\ No newline at end of file
diff --git a/Vridhi_primeno_q9.c b/Vridhi_primeno_q9.c
new file mode 100644
index 0000000..7e7dc6b
--- /dev/null
+++ b/Vridhi_primeno_q9.c
@@ -0,0 +1,16 @@
+#include <stdio.h>
+int main(){
+    int n,flag= 0;
+    scanf("%d",&n);
+    for(int i = 2;i <= n/2;i++){
+        if(n%i==0){
+            flag = 1;
+            break;
+        }
+        
+    }if((flag == 0) && (n > 1)){
+            printf("%d is a prime",n);
+        }else{
+            printf("%d is not a prime",n);
+        }
+}
\ No newline at end of file
diff --git a/Vridhi_primeno_q9.exe b/Vridhi_primeno_q9.exe
new file mode 100644
index 0000000..ec07c41
Binary files /dev/null and b/Vridhi_primeno_q9.exe differ
diff --git a/Vridhi_primeno_q9.py b/Vridhi_primeno_q9.py
new file mode 100644
index 0000000..3b09e57
--- /dev/null
+++ b/Vridhi_primeno_q9.py
@@ -0,0 +1,7 @@
+n = int(input(""))
+for i in range(2,n):
+    if n % i == 0:
+        print("Not a prime")
+        break
+else:
+    print("prime")
\ No newline at end of file
diff --git a/Vridhi_reverseofano_q12.c b/Vridhi_reverseofano_q12.c
new file mode 100644
index 0000000..dd47be9
--- /dev/null
+++ b/Vridhi_reverseofano_q12.c
@@ -0,0 +1,9 @@
+#include <stdio.h>
+int main(){
+    int n;
+    scanf("%d",&n);
+    while(n>0){
+        printf("%d",n%10);
+        n = (int)(n / 10);
+    }
+}
\ No newline at end of file
diff --git a/Vridhi_reverseofano_q12.exe b/Vridhi_reverseofano_q12.exe
new file mode 100644
index 0000000..6418385
Binary files /dev/null and b/Vridhi_reverseofano_q12.exe differ
diff --git a/Vridhi_reverseofano_q12.py b/Vridhi_reverseofano_q12.py
new file mode 100644
index 0000000..fcd4f65
--- /dev/null
+++ b/Vridhi_reverseofano_q12.py
@@ -0,0 +1,4 @@
+n = int(input("n: "))
+m = str(n)
+reverse = m[::-1]
+print(reverse)
diff --git a/Vridhi_sumofdigits_q11.c b/Vridhi_sumofdigits_q11.c
new file mode 100644
index 0000000..343a364
--- /dev/null
+++ b/Vridhi_sumofdigits_q11.c
@@ -0,0 +1,18 @@
+#include <stdio.h>
+int main(){
+    int n, sum = 0;
+    scanf("%d",&n);
+    if(n>=0){
+        goto WHILE;
+    }else{
+        n = -n;
+        goto WHILE;
+    }
+    
+    WHILE:
+    while(n>0){
+        sum += n % 10;
+        n = (int)(n / 10);
+    }
+    printf("%d",sum);
+}
\ No newline at end of file
diff --git a/Vridhi_sumofdigits_q11.exe b/Vridhi_sumofdigits_q11.exe
new file mode 100644
index 0000000..42a09f8
Binary files /dev/null and b/Vridhi_sumofdigits_q11.exe differ
diff --git a/Vridhi_sumofdigits_q11.py b/Vridhi_sumofdigits_q11.py
new file mode 100644
index 0000000..650d078
--- /dev/null
+++ b/Vridhi_sumofdigits_q11.py
@@ -0,0 +1,14 @@
+n = int(input("n: "))
+def sumofdigits(m):
+    sum = 0
+    while m > 0:
+        sum += m % 10
+        m = m // 10
+    return sum
+
+if n > 0:
+    sum2 = sumofdigits(n)
+else:
+    n = -n
+    sum2 = sumofdigits(n)
+print(sum2)
diff --git a/Vridhi_sumoffirstnnatural_q4.c b/Vridhi_sumoffirstnnatural_q4.c
new file mode 100644
index 0000000..f93bf3d
--- /dev/null
+++ b/Vridhi_sumoffirstnnatural_q4.c
@@ -0,0 +1,14 @@
+#include <stdio.h>
+int main(){
+    int n;
+    int sum = 0;
+    scanf("%d", &n);    
+    if (n>=0){
+        for(int i = 1; i <= n; i++ ){
+            sum += i;
+        }}
+        else{
+            printf("negative number not allowed.");
+        }
+        printf("sum = %d",sum);
+}
\ No newline at end of file
diff --git a/Vridhi_sumoffirstnnatural_q4.exe b/Vridhi_sumoffirstnnatural_q4.exe
new file mode 100644
index 0000000..4ee2d54
Binary files /dev/null and b/Vridhi_sumoffirstnnatural_q4.exe differ
diff --git a/Vridhi_sumoffirstnnatural_q4.py b/Vridhi_sumoffirstnnatural_q4.py
new file mode 100644
index 0000000..49220d1
--- /dev/null
+++ b/Vridhi_sumoffirstnnatural_q4.py
@@ -0,0 +1,2 @@
+n = int(input("n: "))
+print("sum: ",int((n*(n+1))*0.5))
\ No newline at end of file
diff --git a/Vridhi_sumofninrange_q5.c b/Vridhi_sumofninrange_q5.c
new file mode 100644
index 0000000..4725294
--- /dev/null
+++ b/Vridhi_sumofninrange_q5.c
@@ -0,0 +1,10 @@
+#include <stdio.h>
+int main(){
+    int m, n;
+    scanf("%d %d",&m,&n);
+    int sum = 0;
+    for(int i = m; i<=n;i++){
+        sum += i;
+    }
+    printf("%d",sum);
+}
\ No newline at end of file
diff --git a/Vridhi_sumofninrange_q5.exe b/Vridhi_sumofninrange_q5.exe
new file mode 100644
index 0000000..b95772d
Binary files /dev/null and b/Vridhi_sumofninrange_q5.exe differ
diff --git a/Vridhi_sumofninrange_q5.py b/Vridhi_sumofninrange_q5.py
new file mode 100644
index 0000000..43d9fec
--- /dev/null
+++ b/Vridhi_sumofninrange_q5.py
@@ -0,0 +1,7 @@
+#Sum of range
+m = int(input("start from: "))
+n = int(input("end including: "))
+sum = 0
+for i in range(m,n+1,1):
+    sum = sum + i
+print(sum)
\ No newline at end of file
diff --git a/Vridhi_sumofnnatural_q3.c b/Vridhi_sumofnnatural_q3.c
new file mode 100644
index 0000000..f93bf3d
--- /dev/null
+++ b/Vridhi_sumofnnatural_q3.c
@@ -0,0 +1,14 @@
+#include <stdio.h>
+int main(){
+    int n;
+    int sum = 0;
+    scanf("%d", &n);    
+    if (n>=0){
+        for(int i = 1; i <= n; i++ ){
+            sum += i;
+        }}
+        else{
+            printf("negative number not allowed.");
+        }
+        printf("sum = %d",sum);
+}
\ No newline at end of file
diff --git a/Vridhi_sumofnnatural_q3.exe b/Vridhi_sumofnnatural_q3.exe
new file mode 100644
index 0000000..f5aafa2
Binary files /dev/null and b/Vridhi_sumofnnatural_q3.exe differ
diff --git a/Vridhi_sumofnnatural_q3.py b/Vridhi_sumofnnatural_q3.py
new file mode 100644
index 0000000..081dc31
--- /dev/null
+++ b/Vridhi_sumofnnatural_q3.py
@@ -0,0 +1,6 @@
+n = int(input("sum upto : "))
+sum = 0
+for i in range(0,n+1):
+    sum += i
+
+print("sum: ",sum)
\ No newline at end of file