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+2 votes
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https://gateoverflow.in/?qa=blob&qa_blobid=14433986388826671915

int main()
{
    int a = 10;
    int *b = &a;
    scanf("%d",b);
    printf("%d",a+50);
}

What will be the Output of the following code if input given is $25$ ?

in Programming by (157 points)
edited by | 136 views

3 Answers

+1 vote
int main() {
 int a=10;            // value of a =10;
 int *b=&a;          // pointer b stores the address of a i.e. points to a
 scanf("%d",b);     // b gets a value from user(25) and stores it in a since b points to a
 printf("%d",a+50);  // here a = (value which user gave + 50)= 25+50 = 75
 return 0;
}

$\therefore$ here value of $a$ = (value which user gave + 50) = 25+50 = $75$ will be printed as output.

by Boss (20.9k points)
0
I'm having a doubt that b contains address of a than how can we update the value of a as=25 rather than not updating any value
Plz help with an approach for my doubt.
+1

scanf reads data from stdin(here it is 25) and stores them according to the parameter format (here it is %d) into the locations pointed by the additional arguments.(i.e stores in location pointed by b)

we generally write scanf as scanf("%d" , &a); and here b = &a;

So we can write scanf("%d",b);

0 votes

Output 75

 

by (129 points)
0 votes
The output will be 75 if input given is 25
by (289 points)

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