当我在 c 中添加具有值的变量时获取垃圾值，同时查找位数并打印数字的反转

Question

I am writing a program to count number of digit and reverse the number but the garbage value is getting printed when assign value to datatype while declaring

#include<stdio.h>
int main()
{ 
    int n=213,t=0,a,e,i=0;
    e=n;
    while(e!=0)
    { 
        e/=10;
        i++;
    }
    printf("%d",i);

    while(n!=0){
        t=n%10;
        a=a*10+t;
        n/=10;
    }
    printf("%d",a);
    return 0;
}

Answer 1

You need to initialize the variable a with zero, before doing this

a=a*10+t; /* a contains garbage data here, initialize it before */

else a default contains garbage value due to its automatic storage . For eg

int n=213,t=0,a = 0 /* initialize a with 0 */,e,i=0;