52 lines
1.3 KiB
C
52 lines
1.3 KiB
C
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
|
|
static int addIntOvf(int result, int a, int b) {
|
|
result = a + b;
|
|
if(a > 0 && b > 0 && result < 0)
|
|
return -1;
|
|
if(a < 0 && b < 0 && result > 0)
|
|
return -1;
|
|
return 0;
|
|
}
|
|
|
|
int main() {
|
|
int num1, num2, sum;
|
|
FILE *flag;
|
|
char c;
|
|
|
|
printf("n1 > n1 + n2 OR n2 > n1 + n2 \n");
|
|
fflush(stdout);
|
|
printf("What two positive numbers can make this possible: \n");
|
|
fflush(stdout);
|
|
|
|
if (scanf("%d", &num1) && scanf("%d", &num2)) {
|
|
printf("You entered %d and %d\n", num1, num2);
|
|
fflush(stdout);
|
|
sum = num1 + num2;
|
|
if (addIntOvf(sum, num1, num2) == 0) {
|
|
printf("No overflow\n");
|
|
fflush(stdout);
|
|
exit(0);
|
|
} else if (addIntOvf(sum, num1, num2) == -1) {
|
|
printf("You have an integer overflow\n");
|
|
fflush(stdout);
|
|
}
|
|
|
|
if (num1 > 0 || num2 > 0) {
|
|
flag = fopen("flag.txt","r");
|
|
if(flag == NULL){
|
|
printf("flag not found: please run this on the server\n");
|
|
fflush(stdout);
|
|
exit(0);
|
|
}
|
|
char buf[60];
|
|
fgets(buf, 59, flag);
|
|
printf("YOUR FLAG IS: %s\n", buf);
|
|
fflush(stdout);
|
|
exit(0);
|
|
}
|
|
}
|
|
return 0;
|
|
}
|