prepare (1/3): 
finished

make (2/3): 
gcc -std=gnu11 -O2 -Wall  -o main main.c util.c
main.c: In function 'main':
main.c:6:5: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d", &e_num);
     ^~~~~~~~~~~~~~~~~~~
main.c:7:5: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d", &v_num);
     ^~~~~~~~~~~~~~~~~~~
main.c:12:9: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d %d %d", &v1, &v2, &w);
         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
main successfully constructed
finished

clean (3/3): 
finished

all task finished, build successfully