algorithm - C - reverse a number -

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i coding in c on linux, , need reverse number. (eg: 12345 turn 54321), going convert string using itoa , reverse that, it's lot easier string manipulation, turns out itoa non standard , isn't included in gcc. there way of doing binary rotation style thing on decimal numbers , if not approach should take?

int n; scanf("%d",&n); int rev=0,rem; while(n>0) {     rem=n%10; //take out remainder .. becomes 5 12345     rev=rev*10+rem; //multiply current number 10 , add remainder.     n=n/10; //divide number. becomes 1234. } printf("%d",rev);

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