wap to change string lower case to upper case without using standard library function .
#include<stdio.h>
#include<conio.h>
main()
{
char a[20];
int x,i=0,n;
printf("enter string in lower case:");
gets(a);
printf("string in lower case %s",a);
// puts(a);
while(a[i] != '\0')
{
a[i]= a[i]-32;
i++;
}
printf("\nupper case string %s",a);
}
output :
enter string in lower case:rahul
string in lower case rahul
upper case string RAHUL
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