Linux 下C编程笔记

1、源码

#include<stdio.h>

main(){

FILE *fp;

char str[11];

if((fp=fopen("d:\\jrzh\\example\\string","rt"))==NULL){

printf("\nCannot open file strike any key exit!");

getch();

exit(1);

}

fgets(str,11,fp);

printf("\n%s\n",str);

fclose(fp);

}

 

编译：

[root@localhost C]# gcc -o fgets fgets.c 
fgets.c: In function 'main':
fgets.c:8: warning: incompatible implicit declaration of built-in function 'exit'
/tmp/ccmZM2Va.o: In function `main':
fgets.c:(.text+0x40): undefined reference to `getch'
collect2: ld returned 1 exit status

解决办法：

在文件中添加库文件：#include<stdlib.h>

编译： gcc -o fgets fgets.c   -I/usr/include -L/usr/lib -lncurses