#Getting unexpected result from my code. Can't detect why?

27 messages · Page 1 of 1 (latest)

stable owl
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Q: Two numbers will be given. I have to show the sum, sub and multi of them. Here is my code:
#include <stdio.h>

int main(){
int a, b;
long long int result1, result2, result3;

scanf("%d%d", &a, &b);

result1=a+b;
result2=a*b;
result3=a-b;

printf("%d + %d = %lld\n", a, b, result1);
printf("%d * %d = %lld\n", a, b, result2);
printf("%d - %d = %lld\n", a, b, result3);

return 0;

}

Expected result:
60642 + 92657 = 153299
60642 * 92657 = 5618905794
60642 - 92657 = -32015
Result I am getting:
60642 + 92657 = 153299
60642 * 92657 = 1323938498
60642 - 92657 = -32015
Can you explain why it's happening only with multiplication?

fair nimbusBOT
#

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cobalt apex
cobalt apex
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use %lld for them all

stable owl
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okay, let me try

cobalt apex
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if it's gcc then -Wall -W -pedantic are some that you should use

stable owl
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okay, I updated my code as you said. But, still showing the same result.

cobalt apex
stable owl
cobalt apex
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what does your code look liken ow

cobalt apex
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i see

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a and b are both ints so this is doing int multiplication and the result is larger than the maximum int value

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you'll either have to store both a & b as long longs

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or typecast a * b as long long

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result2 = (long long) a * b;

stable owl
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yeah, thanks. Typecast is working. But, if I change datatype of a&b to long long. Then not working.

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Can you tell me why this is happening?

unknown.png
cobalt apex
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but the scanf call still expects ints because of %d

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change the %d to %li to store them as long long ints instead of ints

fair nimbusBOT
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@stable owl Has your question been resolved? If so, run !solved :)

stable owl
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wow, thank you so much for you great support.

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!solved