学步园

多用assert，能很好找到程序出错位置。
// assert.c<br /> #include <stdio.h><br /> #include <stdlib.h><br /> #include <string.h></p> <p>/* 断言。当f为假时，输出当前断言的表达式，及代码所在位置的信息（函数名、源文件名、行号），并退出程序，返回-1。 */<br /> #define ASSERT()/<br /> printf("__funtion__:%s(), __file__:%s, __line__:%d/n",__func__,__FILE__,__LINE__)<br /> #define ASSERT_MSG(f,msg) /<br /> if (!(f)){ /<br /> printf("***ERROR***(%s): /"%s/" must be true, __funtion__:%s(), __file__:%s, "/<br /> "__line__:%d/n",msg,#f,__func__,__FILE__,__LINE__); /<br /> exit(-1); /<br /> }<br /> #define ASSERT_MSG_FMT(f,fmt,args...) /<br /> if (!(f)){ /<br /> printf("***ERROR***: /"%s/" must be true, __funtion__:%s(), __file__:%s, "/<br /> "__line__:%d/n",#f,__func__,__FILE__,__LINE__); /<br /> printf(fmt,##args); /<br /> printf("/n"); /<br /> exit(-1); /<br /> }<br /> /** 注意，如果上面换行时，不多加两个引号，则输出时，下一行前面的空格也行被输出。 */<br /> void fun(char* str1,char* str2)<br /> {<br /> // ASSERT();<br /> ASSERT_MSG(!strcmp(str1,str2),"the two string isn't equal");<br /> }<br /> /**<br /> * 判断输入两个参数是否相等<br /> */<br /> int main(int argc,char *argv[])<br /> {<br /> printf("this is a test for assert，by yuanzhenhai/n");<br /> // ASSERT();<br /> ASSERT_MSG(argc == 3,"argc != 3");<br /> fun(argv[1],argv[2]);<br /> printf("the two strings that you input is equal,successful!/n");<br /> return 0;<br /> }

测试
1、输入参数个数不等于2时

yuan@yuan:~/work/test> ./assert test
this is a test for assert，by yuanzhenhai
***ERROR***(argc != 3): "argc == 3" must be true, __funtion__:main(),  __file__:assert.c,  __line__:42

2、输入参数个数等于2，但两个参数字符串不相等时

yuan@yuan:~/work/test> ./assert test testtt
this is a test for assert，by yuanzhenhai
***ERROR***(the two string isn't equal): "!strcmp(str1,str2)" must be true, __funtion__:fun(),  __file__:assert.c,  __line__:32

3、输入参数个数等于2，两个参数字符串也相等时

yuan@yuan:~/work/test> ./assert test test
this is a test for assert，by yuanzhenhai
the two strings that you input is equal,successful!