prepare (1/3): 
finished

make (2/3): 
gcc -g -Wall -O2 -o main.o -c main.c 
main.c: In function 'main':
main.c:35:5: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d", &e_num);
     ^~~~~~~~~~~~~~~~~~~
main.c:36:5: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d", &v_num);
     ^~~~~~~~~~~~~~~~~~~
main.c:43:9: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d", &start);
         ^~~~~~~~~~~~~~~~~~~
main.c:44:9: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d", &end);
         ^~~~~~~~~~~~~~~~~
main.c:45:9: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d", &weight);
         ^~~~~~~~~~~~~~~~~~~~
gcc -g -Wall -O2 -o main main.o
finished

clean (3/3): 
finished

all task finished, build successfully