Program To Reverse The Character (Case Of Character)

Program To Reverse Case Of Character

getchar() is similar to scanf(). islower() is a system-defined function under ctype.h header file to check if the character is in lowercase or not.toupper() converts the input parameter into equivalent uppercase char. putchar() is similar to printf().

Example To Reverse The Character Case

#include<stdio.h>
#include<ctype.h> // to use system defined function islower & toupper

int main()
{
    char alphabet;
    printf("Enter an alphabet: ");
    putchar('\n');  // to move to next Line

    alphabet=getchar();

    printf("\n\nReverse case of %c is:  ",alphabet);

    if(islower(alphabet))
        putchar(toupper(alphabet));

    else 
        // must be an uppercase character
        printf("%c",tolower(alphabet)) ;
    return 0;
}

Output:

Enter an alphabet: a
Reverse case of s is: A

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