C - Root 没有打印正确的值，没有从 sum 改变

Question

这是家庭作业的一部分，用户在其中输入五个整数，并通过几个函数得到总和、平均值、sqrt 和其他一些东西。代码如下：

#include <stdio.h>
#include <math.h>

// needs to be declared in order to work
int functionPrint(int sum, int root);

//sum function, takes all the ints from main and sums it up
int functionSum(int one, int two, int three, int four, int five) {
    int sum = one + two + three + four + five;
    // sends the sum to the print function
    sum = functionPrint(sum, sum);
}

//sqrt function, will take all numbers and square root them
int functionSqrt(int one, int two, int three, int four, int five) {
    int root = sqrt(three);
    // sends the sqrt numbers to print
    root = functionPrint(root, root);
}

int functionPrint(int sum, int root) {
    printf("Sum: %d\n", sum);
    printf("Square Root: %d\n", root);
}

//main function, all values to be worked are created here and sent to the other functions
int main() {
    int sumMain, one, two, three, four, five;

    printf("Enter five numbers separated by spaces: ");
    scanf("%d%d%d%d%d", &one, &two, &three, &four, &five);

    sumMain = functionSum(one, two, three, four, five);
}

目前，它应该只打印出 int 三的总和和 sqrt（当我解决这个问题时，我将包括其他 int）。 functionPrint() 从第 21 行开始，functionSqrt() 从第 15 行开始。但是，就像我说的，它只打印总和。我的猜测是存在一些必须被覆盖的变量，或者类似的东西。但话说回来，我不是专家。

任何帮助将不胜感激

Answer 1

添加#include <stdlib.h> 并将scanf 更改为：

int result = scanf("%d%d%d%d%d", &one, &two, &three, &four, &five);
if (result != 5)
{
    fprintf(stderr, "Error, failed to read five numbers.\n");
    exit(EXIT_FAILURE);
}

这将测试输入问题。尽早测试并报告问题总是好的，而不是让程序在以后以奇怪的方式继续失败。

将functionSum 更改为返回一个值。 functionSum 用int functionSum(…) 声明，这意味着它应该返回一个值。要真正返回一个值，您需要在其中添加 return 语句：

int functionSum(int one, int two, int three, int four, int five)
{
    return one + two + three + four + five;
}

在main程序中，在functionSum之后调用functionPrint：

sumMain = functionSum(one, two, three, four, five);
functionPrint(sumMain, 0);

这应该负责计算总和并打印它。了解这些变化应该有助于您在平方根方面取得进步。

Answer 2

1. 在 main() 中

   scanf("%d%d%d%d%d", &one, &two, &three, &four, &five);
   

scanf() 将无法按您的意愿工作，形成字符串（“%d%d%d%d%d”）中没有特定的分隔符，您将如何划分 5 个输入？

1. 在 main() 中

   sumMain = functionSum(one, two, three, four, five);
   

sumMain不会得到你想要的sum值，因为functionSum()不会“返回”任何值，请自行google“C语言”+“返回”。

1. 根据您在步骤 2 中的搜索结果修改了 functionSum() 和 functionSqrt()。您可能不需要 functionPrint()。

Answer 3

根据所需输出对您的程序进行修改：

#include <stdio.h>
#include <math.h>

// needs to be declared in order to work
int functionPrint(int sum, int root);

//sum function, takes all the ints from main and sums it up
int functionSum(int one, int two, int three, int four, int five) {
    int sum = one + two + three + four + five;
    float sqrt = functionSqrt(one,two,three,four,five);  // Called the Sqrt function and receives the square root of the third number
    // sends the sum to the print function
    sum = functionPrint(sum, sqrt);
}

//sqrt function, will take all numbers and square root them
int functionSqrt(int one, int two, int three, int four, int five) {
    int root = sqrt(three);
    return root;
    // sends the sqrt numbers to print
  //  root = functionPrint(root, root);
}

int functionPrint(int sum, int root) {
    printf("Sum: %d\n", sum);
    printf("Square Root: %d\n", root);
}

//main function, all values to be worked are created here and sent to the other functions
int main() {
    int sumMain, one, two, three, four, five;

    printf("Enter five numbers separated by spaces: ");
    scanf("%d%d%d%d%d", &one, &two, &three, &four, &five);

    sumMain = functionSum(one, two, three, four, five);
}