strlen/string函數-linux

#include <stdio.h>int main(void){        char * str = "123456789";        char p[10] = {0};        char t[10] = "123";        char a[10] = {'1','2','3','4','5','\0','7','8'};        char b;        int c;        long d;        double e;                printf( "%d\n", sizeof(b) );//1[注釋：變數類型]        printf( "%d\n", sizeof(c) );//4        printf( "%d\n", sizeof(d) );//4        printf( "%d\n", sizeof(e) );//8        printf( "%d\n", sizeof(str) );//4        printf( "%d\n", strlen(str) );//9[注釋：計算字串長度，不包括'\0']        printf( "%d\n", sizeof(p) );//10        printf( "%d\n", strlen(p) );//0        printf( "%d\n", sizeof(t) );//10        printf( "%d\n", strlen(t) );//3        printf( "%d\n", sizeof(a) );//10        printf( "%d\n", strlen(a) );//5        printf( "%d\n", sizeof(a[1]) );//1        printf( "%d\n", strlen(&a[1]) );//4[注釋：從'2'到'\0']        return 0;}

，strlen是。

，傳遞給strlen就了。

，strlen只能用，且必須是以