单选题有以下程序:#includeintfun(char*s){ char*p=s; while(*p++!='\0'); return(p-s);}main(){ char*p=01234; printf(%d,fun(p));}程序的运行结果是( )。A6B5C4D3
单选题
有以下程序:
#include
int fun(char *s)
{
char *p=s;
while(*p++!='\0');
return(p-s);
}
main()
{
char *p=01234;
printf(%d,fun(p));
}
程序的运行结果是( )。
A
6
B
5
C
4
D
3
参考解析
解析:
程序执行过程为:定义字符串指针p并为其初始化为“01234”,调用函数fun(p),将指针传入函数。while循环找到字符串的束符地址,然后使这个指针指向结束符下一个单元,结束循环。返回字符串首地址与结束符下一个地址之差,也即是字符串长度加1。输出地址差为6,答案选择A选项。
程序执行过程为:定义字符串指针p并为其初始化为“01234”,调用函数fun(p),将指针传入函数。while循环找到字符串的束符地址,然后使这个指针指向结束符下一个单元,结束循环。返回字符串首地址与结束符下一个地址之差,也即是字符串长度加1。输出地址差为6,答案选择A选项。
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