C Programming - Pointers - Discussion
Discussion Forum : Pointers - Find Output of Program (Q.No. 14)
14.
What will be the output of the program ?
#include<stdio.h>
int main()
{
char *str;
str = "%d\n";
str++;
str++;
printf(str-2, 300);
return 0;
}
Discussion:
43 comments Page 3 of 5.
Rishu said:
8 years ago
I think its wrong because we can't increment a string constant pointer.
Aditya Pandey said:
9 years ago
Let adress of str =5000.
When it increased twice = 500+(1*4)+1*4)=5008.
But in the next line, there is str-2, it comes back on it's previous location.
So it prints value 300.
When it increased twice = 500+(1*4)+1*4)=5008.
But in the next line, there is str-2, it comes back on it's previous location.
So it prints value 300.
HarshaN said:
1 decade ago
@Vallabh
Why only one argument in the printf gets printed instead of two arguments in your second example?
Some one pls explain
Why only one argument in the printf gets printed instead of two arguments in your second example?
Some one pls explain
Archana said:
2 decades ago
Twice str is incremented n then when we do str-2, it is again pointing to starting position. So str contains "%d\n".
So printf statement would be like printf("%d\n",300);
Hence output will be 300.
So printf statement would be like printf("%d\n",300);
Hence output will be 300.
Sunitha said:
1 decade ago
Thank you very much archana.
Sohan lal mits said:
1 decade ago
We know that when we increament pointer wihh n values like then pointer point to nth value address and whereas pointer decrease with nth value so pointer locate same address as previus so according question
char *str;
str = "%d\n";
str++;
str++;
printf(str-2, 300);
output:300
char *str;
str = "%d\n";
str++;
str++;
printf(str-2, 300);
output:300
Suresh said:
1 decade ago
Thank you sohan lal mits. There is clearance in your explanation. Thanks a lot.
Pavan said:
1 decade ago
Thank you sohan and archana.
Sujith said:
1 decade ago
str-2 one's incremented then it becomes str-1
then again incremented then it becomes str
then str="%d\n"; then 300 will print
then again incremented then it becomes str
then str="%d\n"; then 300 will print
Jasmin said:
1 decade ago
Can any body explain what happened to printf (str-2, 300) why only 300 is answer ? Why the value of str-2 is not printed. ?
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