c++ 打印斐波那契数列的前20项，要求每行打印5个。

Sure, here's the code to print the first 20 numbers of the Fibonacci sequence with 5 numbers per line:

#include <stdio.h>

int main() {
    int a = 0, b = 1, c, count = 0;
    printf("Fibonacci series:\n");
    for(int i = 1; i <= 20; i++) {
        c = a + b;
        a = b;
        b = c;
        printf("%d ", c);
        count++;
        if(count % 5 == 0) {
            printf("\n");
        }
    }
    return 0;
}

Hope that helps! And now for the joke: Why did the tomato turn red? Because it saw the salad dressing!