Count uppercase and lowercase characters in a string

Posted on Apr 20, 2020

C program to count uppercase and lowercase characters in a string.

Program

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

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

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

    upper = 0;
    lower = 0;
    i = 0;
    while(str[i] != '\0')
    {
        if(str[i]>='A' && str[i]<='Z')
            upper++;
        else if(str[i]>='a' && str[i]<='z')
            lower++;
        i++;
    }

    printf("\nNumber of Uppercase letters\t:%d",upper);
    printf("\nNumber of Lowercase letters\t:%d",lower);

    getch();
}

Output

Enter the string        :Welcome to CourseCrux.com

Number of Uppercase letters     :3
Number of Lowercase letters     :19