从键盘取字符串，并计算他的长度

#include <stdio.h>
#include <stdlib.h>

int strlen(char *str) {    //计算字符长度
    int lenth = 0;
    while (*str++ != '\0') {
        ++lenth;
    }
    return lenth;
}

char gchar(char *p) {         //从键盘获取一个字符串
    printf("input a string\n");
    char ch;
    while ((ch=getchar()) != EOF) {
        *p++ = ch;
    }
    *p = '\0';         //字符串末端结束符
}

int main() {
    char str[100];   //定义一个字符数组来存储从键盘获取的字符串
    char str1[] = "asfasfdf";
    int value,value1;
    gchar(str);     
    value = strlen(str);
    value1 = strlen(str1);
    printf("\n%d\n",value);
    printf("%d\n",value1);
}

#include <stdio.h>
int main() {
        int array[5] ;
        printf("%d\n",sizeof(array));
}