C Programming: Understand For loop syntax in deep detail
Syntax:
for( A ; B ; C}
{
/* statement or what you want to do */
}
My experience:
- A is initial variable if more than one we use && to separate it.
- B is condition, you may have one condition or many conditions so use && separate it.
- C will be performed if condition(s) B is/are true. C also can do more than one statement so use && between them as well.
Sample 1: Simple For loop
int main(int argc, char *argv[])
{
int a;
{
int a;
for( a=10; a<20; a=a+1 ) /* do one thing per ; as simple */
{
printf("value of a: %d\n",a);
}
return 0;
}
{
printf("value of a: %d\n",a);
}
return 0;
}
Some explanation from online course might not cover all thing For loop can do.
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| Standalone DevC++ uses TIM-GCC version 4.9.2 64-bit |
Sample 2: Old school C compiler with many things to do in For loop
int main(int argc, char *argv[])
{
int a;
/* For loop as shown below do many things in ; */
for( a=10 ; a<20 ; printf("value of a: %d\n",a) && a++);
for( a=10 ; a<20 ; printf("value of a: %d\n",a) && a++);
return 0;
}
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| Standalone DevC++ uses TIM-GCC version 4.9.2 64-bit |
Sample 3: New version of C compiler such as C99 or C11
int main(int argc, char *argv[])
{
/* We can declare variable anywhere such as int a=10 in for loop from C11 or C99 compiler */
for(int a=10 ; a<20 ; printf("value of a: %d\n",a) && a++);
return 0;
}3.1 In case C compiler is not enhanced or new version, It will raise error
It's my intention
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| Standalone C-Free compiler can choose C compiler version |
3.2 In case C compiler is new version so it will be completely compiled
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| Standalone DevC++ TIM-GCC version 4.9.2 64-bit |
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| www.codingground.com uses GNU GCC version 7.1.1 |
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| www.jdoodle.com uses GNU GCC version 8.1.0 |
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www.onlinegdb.com uses GCC 5.4.1 C99 version
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| You may leave comment to improve and know more than this. | Thank you. |
