Nis*_*911 3 c printf variadic-functions
我有一个简单的参数列表.我只是想把它打印到stdout,但我在打印"结束"之前得到了有线输出.有谁知道空行和不可读的字符来自哪里?
输出:
start
hello
hello2
hello3
hello 4
UH??AWAVAUATE1?S1?H??HH?E?
end
void printTest(const char* msg, ...) {
va_list ap;
int i;
const char* curMsg=0;
va_start(ap, msg);
printf("start\n");
for(curMsg= msg ; curMsg!=0 ; curMsg = va_arg(ap, const char*)){
printf("%s\n", curMsg);
}
printf("end\n");
va_end(ap);
}
int main(){
printTest("hello", "hello2", "hello3", "hello 4");
return 0;
}
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当你没有传递一个时,你期望如何读取一个空指针来终止循环?将通话更改为:
printTest("hello", "hello2", "hello3", "hello 4", (char *)0);
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