/in/foo.c: In function 'test_for_P1772':
/in/foo.c:24:5: warning: implicit declaration of function 'itoa' [-Wimplicit-function-declaration]
     itoa(i, num1, 10);
     ^~~~
/tmp/ccZjgKLR.o: In function `test_for_P1772':
foo.c:(.text+0xd0): undefined reference to `itoa'
foo.c:(.text+0xe4): undefined reference to `itoa'
foo.c:(.text+0xf7): undefined reference to `itoa'
collect2: error: ld returned 1 exit status