title: How to add two numbers as a string
body: <p>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:</p>
  
  <pre><code>char a[10],b[10];
  printf("enter the two numbers");
  scanf("%s%s",&amp;a,&amp;b);
  char sum[20];
  sum=?
  </code></pre>
  
  <p>A little tip,please?
  Thank you! </p>