1 toupper ()
#include<stdio.h>
#include<ctype.h>
int main(){ char ch; char a;ch=getchar();
a=toupper(ch);
printf("%c",a); return 0;}
2 tolower ()
#include<stdio.h>
#include<ctype.h>
int main(){ char ch;ch=getchar();
char a;a=tolower(ch);
printf("%c",a); return 0;}
3 toascii ()
#include<stdio.h>
#include<ctype.h>
int main(){ char ch;ch=getchar();
int a;a=toascii(ch);
printf("%d",a); return 0;}
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