printf()中的转换说明符始终以％字符开头。 如果要输出％字符，请使用转义序列%%。
#include <stdio.h>
int main(void)
{
int salary; // Declare a variable called salary
salary = 10000; // Store 10000 in salary
printf("My salary is %d.\n", salary);
printf("My salary is %%d.\n", salary);
return 0;
}
