Question: I have to read from standard input two numbers as strings, in C. How can I print their sum as a string too? I have:

```
char a[10],b[10];
printf("enter the two numbers");
scanf("%s%s",&a,&b);
char sum[20];
sum=?

```

A little tip,please?
Thank you!

Answer: 
Just do it like in elementary school

Let's say the input was "...69 + ...63"

```
9 + 3     = 2 and 1 to go
6 + 6 + 1 = 3 and 1 to go
...

```
Convert the strings into numbers using `atoi`, then add them together, and then print the sum using a print function like printf. See [this](http://www.cplusplus.com/reference/cstdlib/atoi/)