21. Write a program to convert a given lowercase string to upper case string without, using the inbuilt string function.

#include<stdio.h>

#include<ctype.h>

#include<conio.h> main()

{

char charac[10]; int k,i;

clrscr();

printf("enter a lowercase string\n"); scanf("%s",charac); k=strlen(charac);

printf("Uppercase of string %s is \n",charac); for(i=0;i<k;i++)

printf("%c",charac[i]+'A'-'a'); getch();

return 0;

}