Compilare: user.c:5:6: warning: return type of ‘main’ is not ‘int’ [-Wmain] void main() ^ user.c: In function ‘main’: user.c:41:12: warning: implicit declaration of function ‘abs’ [-Wimplicit-function-declaration] if (vpozlin[i] < abs(vneglin[i])) ^ user.c:8:9: warning: unused variable ‘buff’ [-Wunused-variable] char buff[255]; ^ user.c:18:14: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fp,"%d%d",&n,&m); ^ user.c:26:21: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fp,"%d",&a[i][j]); ^