How to make user input case-insensitive in C?

Question

#include<stdio.h>

int main()
{
char user[100];
char yes[3];
printf("what u name?\n");
scanf("%s",&user);
printf("so you're %s? \n",&user);
scanf("%s",&yes);

if (&yes==yes)
printf("nice!");

return 0;
}

This is the code

Answer 1

you can either :
use logical operator or || in the condition. (include <string.h> for strcpm)

if(strcmp(yes,"yes") == 0 || strcmp(yes, "Yes") == 0){
}

or :

convert yes to lowercase before the condition ,that way you cover other combinations of yes
then use
if(strcmp(yes , "yes")==0){
}

Answer 2

I think you compare the string through user input

https://qnaplus.com/c-program-to-check-whether-two-strings-are-equal-in-case-insensitive-way/

Hope it's helpful to you

Answer 3

There was no easy way into this, advent of Unicode character sets and the various compiler/system builders implementation adds up to the confusion.

https://stackoverflow.com/questions/23871403/why-are-there-multiple-c-functions-for-case-insensitive-comparison