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;
}