如何修正C语言成绩平均值代码的序数词显示问题（保持行数不变）

Got it, let's tackle this ordinal suffix issue while keeping your code line count exactly the same and making minimal changes.

The Problem #

Your original code uses %dth in the printf statement, but since i starts at 0, you're getting 0th (which is wrong) plus incorrect suffixes for 2 and 3. We need to adjust the numbering to start at 1 and swap the fixed "th" with dynamic suffixes.

Modified Code #

#include<stdio.h>
int main() {
    int marks[10],sum=0,i;
    float avg;
    for(i=0;i<=9;i++) {
        printf("Enter the next element to be inserted into the array\n");
        scanf("%d",&marks[i]);
    }
    for(i=0;i<=9;i++) {
        sum = sum+marks[i];
        printf("mark %d%s=%d\nsum=%d\n",i+1, (i+1)==1?"st":(i+1)==2?"nd":(i+1)==3?"rd":"th", marks[i], sum);
    }
    avg = sum/10;
    printf("The average of the 10 elements of the array is %f",avg);
}

What Changed #

We only modified the printf line in the second loop:

1. Replaced i with i+1 to show the correct 1-10 numbering instead of 0-9.
2. Swapped the fixed "th" with a nested ternary operator that checks the number:
   • If it's 1 → use "st"
   • If it's 2 → use "nd"
   • If it's 3 → use "rd"
   • For all other numbers (4-10) → use "th"

This approach keeps your code line count identical, avoids adding extra variables or conditional blocks, and fixes the suffix display issue perfectly.

内容的提问来源于stack exchange，提问作者coderredoc