在printf函数中转义序列

#include <stdio.h>

int main(void){
    float salary;
    printf(\aEnter your desired monthly salary:);/* 1 */
    printf( $_______\b\b\b\b\b\b\b);             /* 2 */
    scanf(%f, &salary);
    printf(\n\t$%.2f a month is $%.2f a year., salary,
           salary * 12.0);                         /* 3 */
    printf(\rHi!\n);                            /* 4 */

    return 0;
}