"Written test frequently" C language: Deep analysis strlen,sizeof

In the previous blog, I also explored strlen,sizeof differences, details can be seen in the blog http://10740184.blog.51cto.com/10730184/1705820.

About strlen,sizeof can find the length of the string, both of which are the knowledge points in the test interview .

#include <stdio.h> #include <stdlib.h> #include <string.h>//void test1 ()//{//     char* arr =  "hello world!"; /    int len1 = sizeof (arr); &NBSP;&NBSP;&NBSP;&NBSP;//4, addresses are 4 bytes in size//     int len2 = strlen (arr);     //12, find ' n ', total 12 bytes//     printf ("sizeof:%d\n",  len1);//    printf ("strlen:%d\n",  len2) ;//}//void test2 ()//{//    char arr[20] =  "hello world!"; /    int len1 = sizeof (arr);     //-->20 only look at type size//     int len2 = strlen (arr);     //12, find ' n ', no '% ' length//     printf ("sizeof:%d\n",  len1);//    printf ("strlen:%d\n",  LEN2);//}//void test3 ()//{//    char arr[] = " Hello world! "; /    int len1 = sizeof (arr);     //13, with the length//     int len2 = strlen (arr);     //12, find ' n ', no '/' length//     printf ("sizeof:%d\n",  len1);//    printf ("strlen:%d\n",  len2) ;//}//void test4 ()//{//    char arr[] = {  ' h ',  ' e ',  ' l ' ,  ' l ',  ' o '  };//    int len1 = sizeof (arr);    &NBSP;//5, self-judged out of length, no '//    int len2 = strlen ' Length (arr);     //random value, cannot find '//    printf ' ("sizeof:%d\n",  len1);//    printf ("strlen:%d\n",  len2);//}void test5 () {    char arr[10] ;     int len1 = sizeof (arr); &NBSP;&NBSP;&NBSP;&NBSP;//10, judging by its length, without the length   &nbsP; int len2 = strlen (arr);     //random value, cannot find '      ' printf ("sizeof:%d\n",  len1);     printf ("strlen:%d\n",  len2);} Int main () {    /*test1 (); */    /*test2 ();*/     /*test3 (); */    /*test4 (); */    test5 ();     System ("pause");     return 0;}

This article is from the "C language 100-200 Prime" blog, please be sure to keep this source http://10740184.blog.51cto.com/10730184/1740461

"Written test frequently" C language: Deep analysis strlen,sizeof