C program to find reverse of a number #include<stdio.h> int main() { int m,n,r; printf(“\nEnter a number:=”); scanf(“%d”,&n); //123 r=0; while(n>0) { m=n%10; //3 2 1 r=r*10+m; //3 32 321 n=n/10; //12 1 0 } printf(“\nReverse=%d”,r); return  0; } Explanation /* n=123 r=0 m=3 r=3 n=12 m=2 r=32 n=1 m=1 r=321 n=0 */

C program to check whether a number is palindrome or not. #include<stdio.h> int main() { int m,n,r,t; printf(“\nEnter a number:=”); scanf(“%d”,&n); //n=1221 t=n; //t=1221 r=0; while(n>0) { m=n%10; r=r*10+m; n=n/10; } //r=1221 if(t==r) printf(“\nNumber is palendrome”); else printf(“\nNumber is not palendrome”); return 0; }