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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