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C program to count upper case and lower case characters in a string

mahmoud2506
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2022-05-03
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C program to count upper case and lower case characters in a string

This c program will read a string and count total number of uppercase and lowercase characters in it. To test, which is lowercase or uppercase character, we need to check that character is between ‘A’ to ‘Z’ (Uppercase character) or ‘a’ to ‘z’ (Lowercase character).

Example:

    Input string: This is a Test String.

    Output:
    Total Upper case characters: 3, 
    Lower Case characters: 14
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mahmoud2506
2022-05-03
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Program:

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

#include <stdio.h>

int main()
{
    char str[100];
    int countL, countU;
    int counter;

    //assign all counters to zero
    countL = countU = 0;

    printf("Enter a string: ");
    gets(str);

    for (counter = 0; str[counter] != NULL; counter++) {

        if (str[counter] >= 'A' && str[counter] <= 'Z')
            countU++;
        else if (str[counter] >= 'a' && str[counter] <= 'z')
            countL++;
    }

    printf("Total Upper case characters: %d, Lower Case characters: %d", countU, countL);

    return 0;
}

Output

    Enter a string: This is a Test String.
    Total Upper case characters: 3, Lower Case characters: 14

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