A program to reverse the case of input characters is provided below.

islower() is a system-defined function in the ctype.h header file that determines whether a character is in lowercase.

toupper() converts an input parameter to an uppercase equivalent.

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

int main()
{
    
    char word[10];
    printf("Enter a word : ");
 
    gets(word);
    putchar('\n');  // to move to next Line
   for(int i=0;i<10;i++){
    

    char alphabet=word[i];

    if(islower(alphabet))
       word[i]=toupper(alphabet);

    else 
       
        word[i]=tolower(alphabet);
}
printf("%s",word);
   
    return 0;
}

Output:

Enter a word : CoderzPy
cODERZpY

Here, we can clearly see that the cases of all the characters in the input string are reversed.

Note: also read about the Miscellaneous Program(Palindrome Number)

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Rabecca Fatima

Staying up to the mark is what defines me. Hi all! I’m Rabecca Fatima a keen learner, great enthusiast, ready to take new challenges as stepping stones towards flying colors.