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<<Constants average1.c Problems With C I/O>>
#include <stdio.h>
int main(void)
{
        // Read the numbers.
        printf("Enter: ");
        int n1;
        int n2, n3;
        scanf("%d %d %d", &n1, &n2, &n3);

        // Compute the sum and average.
        double sum = n1 + n2 + n3;
        printf("Mean %d %d %d is %f\n", n1, n2, n3, sum/3.0);

        return 0;
}

Variable declaration.
Must follow {

Printf for output.

Scanf for input.
Use & before variables.

Conversions: %d, %f, %c, %x

Assignment.

The ability to declare where you like is new as of C99.
Originally: Only after {

Reading: Ch. 4; pp. 264-270
<<Constants Problems With C I/O>>