Printing ascii chart

Question

I was trying to print complete ASCII chart . Meanwhile I saw this code on tutorialsschool.com website .

#include<stdio.h>
void main() {
int i;
for(i=0;i<=255;i++){
    printf("%d->%c\n",i,i);
}
}

It looks perfect, but the problem is that it is not printing symbols for locations (I'm using Code::Blocks IDE) such as 7,8,9,10 and 32. I am really confused why it not printing values at those locations.And it is giving some weird output on online compilers.Is it the problem of Code::Blocks. What possibly could be the other program to print these ASCII symbols.

Answer 1

I am really confused why it not printing values at those locations.

Because those code is non-printable ASCII code. Note standard ASCII code has only 7 bit (ie 128 characters) - and several of them non-printable (control codes) - so you are not expected to be able print them (eg, can you print the Bell 0x07 ?)

http://www.asciitable.com/

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And as Mohit Jain pointed out, you really need to use isprint function to check if a character is printable on standard C locale before printing it out - very handy function.

Answer 2

You might be interested in knowing that not all the ASCII characters are printable.

For example, decimal 0 to 31 are non-printable ASCII values.

See this reference, which mentions the same.

That said, for a hosted environment, the expected signature of main() is int main(void), at least.