C Programming - Arrays - Discussion
Discussion Forum : Arrays - Find Output of Program (Q.No. 7)
7.
What will be the output of the program in Turb C (under DOS)?
#include<stdio.h>
int main()
{
int arr[5], i=0;
while(i<5)
arr[i]=++i;
for(i=0; i<5; i++)
printf("%d, ", arr[i]);
return 0;
}
Answer: Option
Explanation:
Since C is a compiler dependent language, it may give different outputs at different platforms. We have given the TurboC Compiler (Windows) output.
Please try the above programs in Windows (Turbo-C Compiler) and Linux (GCC Compiler), you will understand the difference better.
Discussion:
38 comments Page 2 of 4.
Vinay yadav said:
1 decade ago
In Turbo C, Compiler return garbage value if the a[0] is not initialized but in GCC it return 0 so output is different.
Mayank said:
1 decade ago
++ has greater preference than assignment, rest you will understand automatically. Its better hint!
Abhishek said:
1 decade ago
In DevC++.
Output are:
2358963,1,2,3,4
Output are:
2358963,1,2,3,4
Hotcpu said:
1 decade ago
I try the online gcc compiler by adding the following code,
while(i<5)
{
arr[i]=++i;
printf("i=%d arr[%d]=%d,%d \n",i,i,arr[i],arr[i-1]);
}
The interesting thing is that in the first step,
it actually did: arr[0]=++0;
So, here is the question should ++ operator affect both side of "="?
while(i<5)
{
arr[i]=++i;
printf("i=%d arr[%d]=%d,%d \n",i,i,arr[i],arr[i-1]);
}
The interesting thing is that in the first step,
it actually did: arr[0]=++0;
So, here is the question should ++ operator affect both side of "="?
Vik said:
1 decade ago
In second for loop the condition not satisfied at last step so it prints garbage value.
Kyaw win thu said:
1 decade ago
I want to know the definition of garbage value with example please.
Gurjar said:
1 decade ago
In GCC compiler (Linux (Fedora 20)) it will give output
4195728, 1, 2, 3, 4,
Where 4195728 is garbage value.
4195728, 1, 2, 3, 4,
Where 4195728 is garbage value.
Thanvi said:
1 decade ago
Can any one explain the difference between a++, ++a ?
Azhar said:
1 decade ago
a++ and ++a is same when we are not assigning any variable to it.
Suppose given int a=1;
Then a++ = 2.
& ++a = also 2.
But give int a = 1, b = 1;
Find.
a = b++.
a = ++b.
Here b++ is post increment and ++b is pre increment, in ++b first increment the value of b by 1 then evaluate it & in b++ (post increment) first evaluate then increment it.
Eg: Pre increment value of b is 1 after increment it becomes 2, now evaluate, evaluate means a=b, the value of b is assign to a, so a=2.
So o/p is 1 = 2 b = 2.
Eg: For post increment.
First evaluate the value i.e a = b then increment the b value. O/p a = 1, b = 2.
Same for decrement.
Note: The value will change a/c to compiler.
Suppose given int a=1;
Then a++ = 2.
& ++a = also 2.
But give int a = 1, b = 1;
Find.
a = b++.
a = ++b.
Here b++ is post increment and ++b is pre increment, in ++b first increment the value of b by 1 then evaluate it & in b++ (post increment) first evaluate then increment it.
Eg: Pre increment value of b is 1 after increment it becomes 2, now evaluate, evaluate means a=b, the value of b is assign to a, so a=2.
So o/p is 1 = 2 b = 2.
Eg: For post increment.
First evaluate the value i.e a = b then increment the b value. O/p a = 1, b = 2.
Same for decrement.
Note: The value will change a/c to compiler.
Nandhinivijayan said:
1 decade ago
What is meant by garbage value? How it is identified? Any one explain me clearly ASAP?
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