Convert string in lowercase to uppercase without using library function

Posted on Apr 20, 2020

C program to convert string in lowercase to uppercase without using library function.

Program

#include<stdio.h>
#include<conio.h>
#define MAX 50

void main()
{
	char str[MAX];
    int i;

    printf("Enter the string in lowercase\t:");
    gets(str);

    i = 0;
    while(str[i] != '\0')
    {
        if(str[i]>=97 && str[i]<=122)
            str[i] = str[i] - 32;
        i++;
    }

    printf("\nString in uppercase is\t:%s",str);

    getch();
}

Output

Enter the string in lowercase   :welcome to coursecrux.com

String in uppercase is  :WELCOME TO COURSECRUX.COM