A to a    or a to A  small to upper case and upper to small Character conversion program in c
#include<stdio.h>
int main(){ int s; char a;
printf(“Enter the sides of triangle\n”);
scanf(“%c”,&a);
if(a>=65 && a<=90){ s=a+32; }
if(a>=91 && a<=122)
{s=a-32;}
printf(“\n %c”, s); }

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