#include<stdio.h>
#include<stdlib.h>
int MAX(int num1, int num2, int num3);
int MIN(int num1, int num2, int num3); 
int SUM(int num1, int num2, int num3);
int PRIME(int num1, int num2, int num3); 
int main(){
    int num1, num2, num3; 
    printf("Input three integers: "); 
    scanf("%d %d %d", &num1, &num2, &num3);
    printf("Max = %d\n", MAX(num1, num2, num3));
    printf("Min = %d\n", MIN(num1, num2, num3));
    printf("Sum = %d\n", SUM(num1, num2, num3));
    printf("Prime = %d\n", PRIME(num1, num2, num3));
    
    system("pause"); 
    return 1;  
} 
     
int MAX(int num1, int num2, int num3){
    if (num1 > num2 && num1> num3 )
    return num1;
    else if (num2 > num1 && num2> num3 )
    return num2;
    else if (num3 > num1 && num3 > num2)
    return num3;
    } 
int MIN(int num1, int num2, int num3){
    if (num1 < num2 && num1< num3 )
    return num1;
    else if (num2 < num1 && num2< num3 )
    return num2;
    else if (num3 < num1 && num3 < num2)
    return num3;
    }         
     
int SUM(int num1, int num2, int num3){
    int num4;
    num4 = num1 + num2 + num3;
    return num4; 
    } 
int PRIME(int num1, int num2, int num3){
    int i; 
        for( i=2 ; num1%i != 0 ; i++ ) return num1;
        for( i=2 ; num2%i != 0 ; i++ ) return num2;
        for( i=2 ; num3%i != 0 ; i++ ) return num3;
        
        else printf("none"); 
         }
// prime那邊弄不出來 該死ˊˋ
int PRIME(int num1, int num2, int num3){
    for( i=2 ; num1%i != 0 ; i++ ) return num1;
    else for( i=2 ; num2%i != 0 ; i++ ) return num2;
    else for( i=2 ; num3%i != 0 ; i++ ) return num3;
    else printf("none")
    }
 
