使用 do while 循环读取 .txt 文件

Question

I'm doing this homework where I need to read a line from a file for each iteration.

I got this inputs:

200 38
220 48
230 68
240 48
260 68
280 68
300 48
0 0

What I need is to read the first 2 ints using fscanf.
Then on the next loop I'll read the next 2 ints and so on. Ex. i'll read 200 38
then i'll read 220 48 on the next loop.
Can somebody help me with this?

#include <stdio.h>

int main() {

    int rate, hours;
    float pay;


    // This program will compute the pay rate of a person based on the working hours.

    FILE *inputFileptr;
    FILE *outputFileptr;

    inputFileptr = fopen("input.txt","rt");
    outputFileptr = fopen("pays.txt","at");

    do {
        fscanf(inputFileptr,"%d %d", &rate, &hours);
        if  ( hours <= 40 ) {
            pay = (hours * rate) / 100.00;
            fprintf(outputFileptr,"Pay at %d centavos/hr for %d hours is %.2f pesos \n", rate, hours, pay);
        }
        else if ( hours <= 60 && hours > 40) {
            pay = ((((hours - 40)* rate) * 1.5) + ( rate * 40)) / 100.00;
            fprintf(outputFileptr,"Pay at %d centavos/hr for %d hours is %.2f pesos \n", rate, hours, pay);
        }
        else if ( hours < 60 ) {
            pay = ((((hours - 60) * rate) * 2) + (((hours - 40)* rate) * 1.5) + (rate * 40));
            fprintf(outputFileptr,"Pay at %d centavos/hr for %d hours is %.2f pesos \n", rate, hours, pay);
        }
    } while ( rate == 0 && hours == 0);

    fclose(inputFileptr);
    fclose(outputFileptr);

    return 0;
}

Answer 1

The expression here in your while loop, means the while loop will continue when rate == 0 && hours == 0 is true, clearly you should change it to rate != 0 && hours != 0 , otherwise it will immediately stop soon as it reads the first line '200 38'.

Meanwhile, your if expression else if ( hours < 60 ) , it should be else if ( hours > 60 ) .