vsprintf函数不适用于结构二维数组

int vsprintf(char *str, const char *format, va_list arg);

#include <stdio.h>

struct MyStruct {
    int num;
    char name[20];
};

int main() {
    struct MyStruct myArray[2][2] = {
        {{1, "John"}, {2, "Alice"}},
        {{3, "Bob"}, {4, "Eve"}}
    };

    char output[100];
    int i, j;
    int offset = 0;

    for (i = 0; i < 2; i++) {
        for (j = 0; j < 2; j++) {
            offset += sprintf(output + offset, "Element [%d][%d]: num=%d, name=%s\n", i, j, myArray[i][j].num, myArray[i][j].name);
        }
    }

    printf("%s", output);

    return 0;
}