macro

I doens't still work; my code now is:

Code:

---

#include <iostream>
#define PRINT(STR, VAR) \
    std::cout<<STR<<" = "<<VAR<<std::endl;

int main (int argc, char argv[]) {
        int i = 10;
        PRINT("var", i);       
        return EXIT_SUCCESS;
}

---

Code:

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error C2143: syntax error : missing ';' before '<<'
error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
error C2371: 'std::cout' : redefinition; different basic types
 see declaration of 'std::cout'
error C2017: illegal escape sequence //this error is on  PRINT("var",i);

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Code:

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#define PRINT(STR, VAR) \

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Please eliminate the blank space after the '\' and re-compile. It works then.

Bharani

Quote:

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Originally Posted by mickey0

I doens't still work; my code now is:

Code:

---

#include <iostream>
#define PRINT(STR, VAR) \
    std::cout<<STR<<" = "<<VAR<<std::endl;

int main (int argc, char argv[]) {
        int i = 10;
        PRINT("var", i);       
        return EXIT_SUCCESS;
}

---

Code:

---

error C2143: syntax error : missing ';' before '<<'
error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
error C2371: 'std::cout' : redefinition; different basic types
 see declaration of 'std::cout'
error C2017: illegal escape sequence //this error is on  PRINT("var",i);

---

---

warning: enclose VAR in () : (VAR), If you have an expression like:

PRINT("1 shift left 5: ", 1 << 5)

this will produce:

std::cout<<"1 shift left 5"<<" = "<< 1 << 5 <<std::endl;

you can see the problem. this is another reason not to use macros.

Quote:

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Originally Posted by ajbharani

Code:

---

#define PRINT(STR, VAR) \

---

Please eliminate the blank space after the '\' and re-compile. It works then.
Bharani

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THANKS!!!!!!!
Now it works even the version on the TC++ that is:

Code:

---

#define PRINT(STR, VAR) \
    std::cout << STR " = " << VAR << std::endl

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THis above compile and work!
It was the white space after '\'
I didn't know that!

Thanks.