Compilare: main.c: In function 'fast_multiply': main.c:10:8: warning: suggest parentheses around comparison in operand of '&' [-Wparentheses] if (k&1==1) ^ main.c:18:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ main.c: In function 'main': main.c:27:2: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(inptr,"%d %d", &n, &p); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~