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字符数组:strlen()函数
#include<stdio.h>
#include<string.h>
int main(){
char a[]={"abcdd"};
printf("数组长度%d\n",strlen(a));
return 0;
}
其他数组:sizeof ( 数组 ) / sizeof( 数组对应的数据类型 )
#include<stdio.h>
#include<string.h>
int main(){
int a[]={1,2,3,4,5};
printf("%d\n",sizeof(a));
printf("%d\n",sizeof(int));
printf("%d\n",sizeof(a)/sizeof(int));
}