[Warning] incompatible implicit declaration of built-in function 'strcat'
2019-01-10 20:11
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今天看完机器学习的课程后,就换C语言学习了一下。也是第一次接触strcat函数 ——字符串连接函数。它的一般形式为strcat(字符数组1,字符数组2) 。其作用是把两个字符数组中的字符串连接起来,把字符串2接到字符串1的后面,结果放在字符数组1中,函数调用后得到一个函数值——字符数组1的地址。例如:
#include<stdio.h> int main() { char str1[30] = {"People's Republic of "}; char str2[] = {"China"}; printf("%s",strcat(str1,str2)); return 0; }
输出代码报错:
In function 'main': [Warning] incompatible implicit declaration of built-in function 'strcat'
百度了一下原因,少加了头文件
#include<stdlib.h> #include<string.h>
加入之后,程序正常输出:
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