同一行上的多个输入

Question

我想在同一行询问学号和标记。

用户输入学号。如果它是有效的，那么它应该向右移动几个空格并允许用户输入标记。

目前它将进入下一行输入我的标记。

#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>

    int main(void)
    {
    int counter;
    int marks[40];
    float num_grades = 0;
    int row = 1;
    float sum = 0;
    float average = 0;
    float pass_average = 0;
    float fail_average = 0;
    int array_pos = 0;
    int fail = 0;
    int pass = 0;
    float pass_sum = 0;
    float fail_sum = 0;
    float biggest = 0;
    float smallest = 0;

    //int grade[40];
    int student_num[40];

    printf("       ---=== IPC mark Analyser V2.0 ===---\n");

    printf("Please enter the number of students(between 3 and 40): ");
    scanf("%d", &counter);


    while (counter > 40 || counter < 3)
    {
        printf("Invalid number, enter a number between 3 and 40 inclusive: ");
        scanf("%d", &counter);

    }

    printf("Row   Std No Mrk\n");
    printf("--- --------- ---\n");

    num_grades = counter;
    while (counter > 0)
    {
        printf("%d ", row);
        printf("___________ ___\r%3d ", row);
        scanf("%d", &student_num[array_pos]);


        while (student_num[array_pos] < 10000000 || student_num[array_pos] >      999999999)
        {
            printf("Error: Enter student number values between 10000000 and 999999999 inclusive.\n");
            printf("%d ", row);
            printf("___________ ___\r%3d ", row);

            scanf("%d", &student_num[array_pos]);
        }


        scanf("%d", &marks[array_pos]);
        //printf("\r%3d %09d ___ ", row, student_num[array_pos]);
        //scanf("%d", &marks[array_pos]);

        while (marks[array_pos] < 0 || marks[array_pos] > 100)
        {
            printf("Error: Enter mark values between 0 and 100 inclusive.\n");
            printf("\r%3d %09d ___ ", row, student_num[array_pos]);
            scanf("%d", &marks[array_pos]);
        }

        if (num_grades == counter)
        {
            smallest = marks[array_pos];
            biggest = marks[array_pos];
        }
        if (marks[array_pos] >= 50)
        {
            pass++;
            pass_sum += marks[array_pos];
        }
        else if (marks[array_pos] < 50)
        {
            fail++;
            fail_sum += marks[array_pos];

        }
        if (marks[array_pos] > biggest)
        {
            biggest = marks[array_pos];
        }
        if (marks[array_pos] < smallest)
        {
            smallest = marks[array_pos];
        }

        row++;
        counter--;
        sum += marks[array_pos];
        array_pos++;
    }


    printf("=================\n");
    printf("Marks Entered, printing results:\n");
    printf("Row   Std No Mrk\n");
    printf("--- --------- ---\n");
    int i;
    for (i = 0; i < num_grades; i++)
    {
        printf("%03d %09d %3d ", i + 1, student_num[i], marks[i]);
        if (marks[i] == biggest) {
            printf("***Highest Mark***");
        }
        if (marks[i] == smallest) {
            printf("***Lowest Mark***");
        }
        printf("\n");
    }


    average = sum / num_grades;
    pass_average = pass_sum / pass;
    fail_average = fail_sum / fail;

    printf("===================\n");
    printf("Total of %d students passed with an average of %.1f.\n", pass, pass_average);
    printf("Total of %d students failed with an average of %.1f.\n", fail, fail_average);
    printf("Highest mark in group: %.0f\n", biggest);
    printf("Lowest mark in group: %.0f\n", smallest);
    printf("The average of all marks in this group is %.1f.\n", average);
    printf("Program Ended.\n");

    return 0;
    }