我已经用 C 创建了一个基本脚本，但我在控制台中收到一个奇怪的错误。有人可以告诉我为什么我的脚本会给出此消息:
undefined reference to 'is_substance_within_x_percent'
源代码:
#include<stdio.h>
#include<stdlib.h>
#include<math.h>
#define P 0.3
#ifndef BOILING_POINTS_H
#define BOILING_POINTS_H
#define SUBSTANCE_CARBONDIOXIDE -78.5
#define SUBSTANCE_AMMONIA -35.5
#define SUBSTANCE_WAX 45.0
#define SUBSTANCE_WATER 100.7
#define SUBSTANCE_OLIVE_OIL 300.0
#define SUBSTANCE_MERCURY 356.9
#define SUBSTANCE_SULFUR 444.6
#define SUBSTANCE_TALC 1500.0
#define SUBSTANCE_SILVER 2212.0
#define SUBSTANCE_COPPER 2562.0
#define SUBSTANCE_GOLD 2700.0
#define SUBSTANCE_IRON 2862.0
#define SUBSTANCE_SILICON 3280.0
#endif
int is_substance_within_x_percent(double t,double p,double boils);
int main( )
{
double t, p, boils;
int substance;
is_substance_within_x_percent(t, p, boils);
printf("Enter the boiling temperature of the substance.\n");
scanf("%lf", &t);
return EXIT_SUCCESS;
}
char * substance_name(double t,int substance)
{
if (t >= SUBSTANCE_CARBONDIOXIDE - P *substance && t <= SUBSTANCE_CARBONDIOXIDE + P *substance)
printf("The substance found is Carbon Dioxyde");
else if (t >= SUBSTANCE_AMMONIA - P *substance && t <= SUBSTANCE_AMMONIA + P *substance)
printf("The substance found is Ammonia");
else if (t >= SUBSTANCE_WAX - P *substance && t <= SUBSTANCE_WAX + P *substance)
printf("The substance found is Wax");
else if (t >= SUBSTANCE_WATER - P *substance && t <= SUBSTANCE_WATER + P *substance)
printf("The substance found is Water");
else if (t >= SUBSTANCE_OLIVE_OIL - P *substance && t <= SUBSTANCE_OLIVE_OIL + P *substance)
printf("The substance found is Olive Oil");
else if (t >= SUBSTANCE_MERCURY - P *substance && t <= SUBSTANCE_MERCURY + P *substance)
printf("The substance found is Mercury");
else if (t >= SUBSTANCE_SULFUR - P *substance && t <= SUBSTANCE_SULFUR + P *substance)
printf("The substance found is Sulfur");
else if (t >= SUBSTANCE_TALC - P *substance && t <= SUBSTANCE_TALC + P *substance)
printf("The substance found is Talc");
else if (t >= SUBSTANCE_SILVER - P *substance && t <= SUBSTANCE_SILVER + P *substance)
printf("The substance found is Silver");
else if (t >= SUBSTANCE_COPPER - P *substance && t <= SUBSTANCE_COPPER + P *substance)
printf("The substance found is Copper");
else if (t >= SUBSTANCE_GOLD - P *substance && t <= SUBSTANCE_GOLD + P *substance)
printf("The substance found is Gold");
else if (t >= SUBSTANCE_IRON - P *substance && t <= SUBSTANCE_IRON + P *substance)
printf("The substance found is Iron");
else if (t >= SUBSTANCE_SILICON - P *substance && t <= SUBSTANCE_SILICON + P *substance)
printf("The substance found is Silicon");
else
printf("This substance is unidentified.");
}
最佳答案
首先，将第二个函数的名称更改为 is_substance_within_x_percent
第二，你没有在 main 中使用substance。
第三，为什么扫描而不使用它。
第四，在 main 中，您声明了三个双参数，并将它们传递给函数，但不知道其中的内容。
关于c - 错误 "undefined reference to"，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/42457523/