Answer Posted / rakesh ranjan

#include<conio.h>
#include<stdio.h>
void main()
{
char str[20],i;
printf("enter your name:");
scanf("%s",str);
for(i=0;str[i]!='\0';i++)
{
if(str[i]<=91)
str[i]+=32;
else
str[i]-=32;
printf("%c",str[i]) ;
}
getch();
}

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