Today is New Year’s Eve. I posted a morning couplet. After lunch
, I’ll learn a little bit. The evening is Happy Night. After New Year’s Eve, you will rebirth from Nirvana and come back against the wind. This sentence is a win!
Yes, Douyin saw it. . .
Too much nonsense, let’s get to the point:
Benefits of file-by-file programming:
Different functional modules can be assigned to different people.
- The internet
- Thread
- Motor
- Ultrasound
- ···
benefit:
- Functional responsibility division
- Easy to debug
- The main program is concise
Example:
A code containing custom functions and main functions
#include <stdio.h>
int add(int x,int y)
{
return x+y;
}
int min(int x,int y)
{
return x-y;
}
int mul(int x,int y)
{
return x*y;
}
int div(int x,int y)
{
return (float)x/y;
}
int main()
{
int data1;
int data2;
int ret;
float ret_float;
printf("请输入数字1：\n");
scanf("%d",&data1);
printf("请输入数字2：\n");
scanf("%d",&data2);
printf("结果为：\n");
ret = add(data1,data2);
printf("%d + %d = %d\n",data1,data2,ret);
ret = min(data1,data2);
printf("%d - %d = %d\n",data1,data2,ret);
ret = mul(data1,data2);
printf("%d * %d = %d\n",data1,data2,ret);
ret_float = div(data1,data2);
printf("%d / %d = %f\n",data1,data2,ret_float);
return 0;
}
normal operation:
After the file is divided:
caclate_T.c
#include <stdio.h>
int main()
{
int data1;
int data2;
int ret;
float ret_float;
printf("请输入数字1：\n");
scanf("%d",&data1);
printf("请输入数字2：\n");
scanf("%d",&data2);
printf("结果为：\n");
ret = add(data1,data2);
printf("%d + %d = %d\n",data1,data2,ret);
ret = min(data1,data2);
printf("%d - %d = %d\n",data1,data2,ret);
ret = mul(data1,data2);
printf("%d * %d = %d\n",data1,data2,ret);
ret_float = div(data1,data2);
printf("%d / %d = %f\n",data1,data2,ret_float);
return 0;
}
caclate_F.c
int add(int x,int y)
{
return x+y;
}
int min(int x,int y)
{
return x-y;
}
int mul(int x,int y)
{
return x*y;
}
int div(int x,int y)
{
return (float)x/y;
}
caclate_F.h
int add(int x,int y); //注意有分号
int min(int x,int y);
int mul(int x,int y);
int div(int x,int y);
Write caclateF.h in caclate_T.c and name it caclate_T2.c
#include <stdio.h>
#include "caclate_F.h"
int main()
{
int data1;
int data2;
int ret;
float ret_float;
printf("请输入数字1：\n");
scanf("%d",&data1);
printf("请输入数字2：\n");
scanf("%d",&data2);
printf("结果为：\n");
ret = add(data1,data2);
printf("%d + %d = %d\n",data1,data2,ret);
ret = min(data1,data2);
printf("%d - %d = %d\n",data1,data2,ret);
ret = mul(data1,data2);
printf("%d * %d = %d\n",data1,data2,ret);
ret_float = div(data1,data2);
printf("%d / %d = %f\n",data1,data2,ret_float);
return 0;
}
Enter in the command line:
gcc caclate_F.c caclate_T2.c
It also runs successfully:
The difference between <> and "" in the header file
<> Is the priority to search and import from the /usr/include/ folder.
"" Is preferentially search and import from the current folder.