c++打印输出沙漏图形

Sure, here's an example of how you can print a diamond pattern using asterisks in C:

#include <stdio.h>

void printLine(int spaces, int stars) {
    for (int i = 0; i < spaces; i++) {
        printf(" ");
    }
    for (int i = 0; i < stars; i++) {
        printf("*");
    }
    printf("\n");
}

void printDiamond(int n) {
    int spaces = n-1;
    int stars = 1;

    // Print upper half
    for (int i = 0; i < n; i++) {
        printLine(spaces, stars);
        spaces--;
        stars += 2;
    }

    spaces = 1;
    stars = n * 2 - 3;

    // Print lower half
    for (int i = 0; i < n-1; i++) {
        printLine(spaces, stars);
        spaces++;
        stars -= 2;
    }
}

int main() {
    int n;
    printf("Enter the number of rows: ");
    scanf("%d", &n);

    printDiamond(n);

    return 0;
}

This program takes the number of rows as input and prints a diamond pattern accordingly. You can adjust the pattern by modifying the `printLine` and `printDiamond` functions.