4. Write a program, which takes a name of the user in the lowercase letters. Call a user defined function upper which will convert all lowercase letters into the uppercase letter. Finally print the string.

#include<stdio.h>

#include<conio.h>

void uppercase(char *);

void main()

{

    char str1[90],str2[90];

    clrscr();

    printf("enter string: ");

    gets(str1);

    printf("\n\nyour string in lowercase: %s",str1);

    uppercase(str1);

    getch();

}

void uppercase(char *str2)

{

    int i;

    for(i=0; str2[i] != '\0'; i++)

    {

        if(str2[i] != ' ')

        {

            str2[i] = str2[i] - 32;

        }

    }

    printf("\n\nyour string in uppercase: %s",str2);

}

/*  output:

enter string: vrushal pandav

your string in lowercase: vrushal pandav

your string in uppercase: VRUSHAL PANDAV

*/