checkbracket

#include <stdio.h>
#include <string.h>

//user defined is_balanced function
int is_balanced(char input[])
{
    char stack[100], check;
    int top, i, length;
    top = 0;
    length = strlen(input);

    for(i=0; i<length; i++){
        //taking forward brackets in stack array
        if(input[i] == '('){
            stack[top] = '(';
            top++;
        }
        else if(input[i] == ')'){ //for this brackets there have to be the opposite one in previous position of the stack array
            if(top == 0){
                return 0;
            }
            top--;
            check = stack[top];
            if(check != '('){
                return 0;
            }
        }
    }
    if(top == 0) return 1;
    else return 0;
}
int main()
{
    char input[100];
    scanf(" %[^\n]", input);

    if(is_balanced(input)){
        printf("%s is balanced\n", input);
    }
    else{
        printf("%s is not balanced\n", input);
    }
    return 0;
}