Rock_paper_scissor.c

#include<stdio.h>
#include<stdlib.h>
#include<time.h>

int rock_paper_scissor(char you,char comp){
    //returns 1 if you win, -1 if you lose and 0 if draw.

    //Condition for draw
    //Cases covered:
    //rr,pp,ss
    if(you == comp){
        return 0;
    }


    //Non-draw conditions
    //Cases covered:
    //rp
    //pr
    //rs
    //sr
    //ps
    //sp

    if(you=='r' && comp=='p'){
        return -1;
    }
    else if(you == 'p' && comp=='r'){
        return 1;
    }

    if(you =='r' && comp=='s'){
        return 1;
    }
    else if(you =='s' && comp=='r'){
        return -1;
    } 
    if(you == 'p' && comp=='s'){
        return -1;
    }
    else if(you =='s' && comp=='p'){
        return 1;
    }
}

int main(){
    char you,comp;
    srand(time(0));
    int number = rand()%100+1;

    if(number<33){
        comp = 'r';
    }
    else if(number>33 && number<66){
        comp= 'p';
    }
    else{
        comp= 's';
    }

    printf("Enter 'r' for Rock, 'p' for Paper and 's' for Scissor\n");
    scanf("%c",&you);
    int result = rock_paper_scissor(you,comp);
    if(result == 0){
        printf("Game Draw!\n");
    }
    else if(result == 1){
        printf("You Win!\n");
    }
    else{
        printf("You Lose!\n");
    }
    printf("You chose %c and computer chose %c.",you,comp);
    return 0;
}