C Programme for a function that will scan a character string passed as an argument and convert all lower-case character into their upper-case equivalent.

Write a function that will scan a character string passed as an argument and convert all lower-case character into their upper-case equivalent.

#include<stdio.h>

#include<conio.h>

void upper(char[]);

int main()

{

            char str[20];

            clrscr();

            printf("Enter string : ");

            gets(str);

            upper(str);

            getch();

            return 0;

}

void upper(char str[20])

{

            int i;

            printf("%s in upper case is ",str);

            for(i=0;str[i];i++)

            {

                        if(str[i]>96 && str[i]<123)

                                    str[i]-=32;

            }

            printf("%s",str);

}

Output:

Enter string : David

David in upper case is DAVID