c语言,求字符数组的长度
练手代码,适用初级码农:
#include<stdlib.h> #include<stdio.h> #include<assert.h> int count(const char * str){//计算数组长度 if(NULL == str) return -1; int len=0; char const *pt= str; while(*pt++) len++; return len; } int count1(const char* str){//计算数组长度 assert(str!=NULL); const char* pt=str; while(*pt) pt++; return pt-str; } int main(){ char* input1 = NULL; char* input2 = "123"; const char* input3 = "456"; char* input4 = ""; char test[]={1,2,3,4,5,6,7,8,‘\0‘}; int length=count(input1); printf("%s = %d \n",input1, count(input1)); printf("%s = %d \n",input2, count1(input2)); printf("%s = %d \n",input3, count1(input3)); printf("%s = %d \n",input4, count(input4)); printf("%s = %d \n",test, count(test)); return 0; }
xu@xu-ThinkPad-X61:~/algorithm$ gcc
countStringLen.c
xu@xu-ThinkPad-X61:~/algorithm$ ./a.out
(null) = -1
123 = 3
456 = 3
= 0
(乱码)= 8
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