C语言：扫描和打印名称

Question

Today, i written a C Programe to scan Two names from keyboard and print it on monitor here it is

char b[2],i;

for(i=0;i<2;i++)
{
    scanf("%s",b[i]);
}
for(i=0;i<2;i++)
{
    printf("%s",b[i]);
}

But Output is runtime Error, I am a Beginner to C. What should i do to make it proper program.

Answer 1

First of all, %s is to intake strings , %c is meant to scan individual characters.

That said, in your case,

1. You did not allocate the spacer for null-terminator in the array.
2. you did not null-terminate the input, either. So even if you want, it cannot be used as a sting .

Answer 2

See what you have declared is wrong char b[2] . You are scanning string values and your declaration says that you want two characters in b array
If you want to accept two string value than your declaration must be:

char *b[1];

Here you can scan the value in the array as:

*b[0] = "string1";
*b[1] = "string2";

OR
You can use two dimensional array for the storage and then your declaratoin would be:

char b[2][100];

Now here, the 100 specifies the number of characters the string you want to enter and 2 is the number of values of the string you are entering.
I hope this will clear your doubts.

Answer 3

You can correct your code as per given below so that you get correct output.

#include<stdio.h>
void main()
{
    char b[2][20];
    int i;
    for(i=0;i<2;i++)
    {
            scanf("%s",b[i]);
    }
    for(i=0;i<2;i++)
    {
            printf("%s\n",b[i]);
    }
}