Eroare de compilare: user.c: In function ‘main’: user.c:26:13: warning: implicit declaration of function ‘ltoa’ [-Wimplicit-function-declaration] ltoa(i2,a,10);//printf("%ld %ld\n",2*i,n+i); ^ /tmp/cceF8jJK.o: In function `main': user.c:(.text.startup+0xd0): undefined reference to `ltoa' user.c:(.text.startup+0x110): undefined reference to `ltoa' user.c:(.text.startup+0x1bc): undefined reference to `ltoa' user.c:(.text.startup+0x201): undefined reference to `ltoa' collect2: error: ld returned 1 exit status