Converting an integer into a string in C

Question

How can an integer be converted into a string in C? Suppose we have an int array:

int a[4]={21,1212,53,4131};

and each int is to be converted in to strings: "21","1212","53","4131".

Answer 1

Basically use itoa or sprintf and/or read the many great detailed answer that were already posted.

Answer 2

Use sprintf or snprintf:

char buf[4][5];
for(int i=0; i<4; i++)
  sprintf(buf[i],"%d",a[i]);

Or

char buf[4][5];
for(int i=0; i<4; i++)
  snprintf(buf[i],sizeof(buf[i]),"%d",a[i]);