#include <stdio.h>

int smallestinteger(int, int, int, int, int); //function prototype
int largestinteger(int, int, int, int, int); //function prototype
int suminteger(int, int, int, int, int); //function prototype
int averageinteger(int, int, int, int, int); //function prototype

// Main typically returns an integer
int main()
{

    int num1 = 0;
    int num2 = 0;
    int num3 = 0;
    int num4 = 0;
    int num5 = 0;
    int intresponse = 0;
        
	// Notice we use five format specifiers (aka %d) 
	// and then provide the address of all five integer variables to put them in.

    printf("\nEnter 5 integers separated by a space, then press enter:  ");
    scanf("%d %d %d %d %d", &num1, &num2, &num3, &num4, &num5);
            

    printf("\nSelect an action to perform: ");
    printf("\nTo determine the smallest integer, enter 1.\n");
    printf("To determine the largest integer, enter 2.\n");
    printf("To determine the sum of the integers, enter 3.\n");
    printf("To determine the average of the integers, enter 4.\n");
    scanf("%d", &intresponse);

	// Remember we have to pass all the variables to the functions since they take 5 parameters
	// They then return a value so we use a variable to hold the return value.
	int smallestintegers = smallestinteger(num1, num2, num3, num4, num5);
	int largestintegers = largestinteger(num1, num2, num3, num4, num5);
	int sumintegers = suminteger(num1, num2, num3, num4, num5);
	int averageintegers = averageinteger(num1, num2, num3, num4, num5);
        
	// Our switch is working fine except you have to specify the integer variables we setup.
	// We could have called the functions directly, but it would have made it look very ugly.

    switch (intresponse) {
        
        case 1:
            printf("\nThe result of the selected action is %d\n.", smallestintegers);
            break;
        case 2:
            printf("\nThe result of the selected action is %d\n.", largestintegers);
            break;
        case 3:
            printf("\nThe result of the selected action is %d\n.", sumintegers);
            break;
        case 4:
            printf("\nThe result of the selected action is %d\n.", averageintegers);
            break;
        default:
            printf("\nPlease run the program again and choose an action from 1 thru 4.");
                printf("\nThe result of the selected action is 0.");
    
     }//end switch  

	// Since main returns an integer, we return 0 saying all is ok.
	return 0;
} //end main


// You defined the function to take five integers so you must call it giving it 5 integers
// It also returns an integer, so you have to make sure you use the "return" statement and return
// the appropriate value, not just print them. 

// If a function was to just print, the function would have to be defined as returning "void"
int smallestinteger (int num1,int num2,int num3,int num4,int num5) //function definition
{    
    if(num1 < num2 && num1 < num3 && num1 < num4 && num1 < num5)
        return num1;
        
    else if(num2 < num1 && num2 < num3 && num2 < num4 && num2 < num5)
        return num2;
        
    else if(num3 < num1 && num3 < num2 && num3 < num4 && num3 < num5)
        return num3;
            
    else if(num4 < num1 && num4 < num2 && num4 < num3 && num4 < num5)
        return num4;
                
    else if(num5 < num1 && num5 < num2 && num5 < num3 && num5 < num4)
        return num5;
}            

// Again returns an integer value so we have to use the return statement.
int largestinteger(int num1,int num2,int num3,int num4,int num5) //function definition
{    if(num1 > num2 && num1 > num3 && num1 > num4 && num1 > num5)
        return num1;
        
    else if(num2 > num1 && num2 > num3 && num2 > num4 && num2 > num5)
        return num2;
        
    else if(num3 > num1 && num3 > num2 && num3 > num4 && num3 > num5)
        return num3;
            
    else if(num4 > num1 && num4 > num2 && num4 > num3 && num4 > num5)
        return num4;
                
    else if(num5 > num1 && num5 > num2 && num5 > num3 && num5 > num4)
        return num5;
}            

// And again we return an integer.
int suminteger(int num1, int num2, int num3, int num4, int num5) //function definition
{
    return (num1 + num2 + num3 + num4 + num5);
}

// Typically a division like this may return a decimal (11/5 is a decimal after all).
// Then you would specify it as returning a double data type, not int. I left it alone for you.

int averageinteger(int num1, int num2, int num3, int num4, int num5) //function definition
{
    return ((num1 + num2 + num3 + num4 + num5) / 5);
}