c program ignores all scanfs after wrong variable type input
#include <stdio.h>
#include <stdlib.h>
int main(void) {
int a, b, checka, checkb;
printf ("enter a: ");
checka = scanf ("%d", &a);
printf ("enter b: ");
checkb = scanf ("%d", &b);
printf ("checka = %dn", checka);
printf ("checkb = %d", checkb);
return EXIT_SUCCESS;
}
I was having this problem in a larger program but I wrote a quick test to see if I could fix it, which I can't.
Basically when anything other than an integer is entered for a scanf, the program just instantly skips and ignores every other scanf and just prints the rest of the program it sees, meaning I can't make checks with a while loop, or I just get an infinite loop as the scanf in the loop to fix the variable just gets skipped.
Obviously if integers are entered this particular program will just return 1 for the last two printfs, which is expected. What am I doing wrong?
Thanks!
有一个原因，我们应该检查scanf的错误，试试这个：
#include <stdio.h>
#include <stdlib.h>
int main(void) {
int a, b, checka, checkb;
printf ("enter a: ");
if((scanf ("%d", &a)) == 1){
checka = a;
}else{
printf("Error(1)!");
exit(EXIT_FAILURE);
}
printf ("enter b: ");
if((scanf ("%d", &b)) == 1){
checkb = b;
}else{
printf("Error(2)!");
exit(EXIT_FAILURE);
}
printf ("checka = %dn", checka);
printf ("checkb = %d", checkb);
return EXIT_SUCCESS;
}
上一篇: 我如何在'while'循环中输入整数值？