Stringizing Macro

The # operator turns a macro argument into a string literal.

stringizing Inside a macro replacement, `#argument` produces the source text of that argument.

labels Stringizing is useful for labels in diagnostics and small reports.

expanded string The string literal in the trace is what the macro would produce before compilation.

                            value
                            value = 3 (default)value = 5value = 8
                        

                            stringizing_macro.c
                        
Replay: real traced execution (multi-file project)

                            #include <stdio.h>

#define LABEL(name) #name

int main(void) {
    int value = 3;
    const char *name = "value";

    printf("%s=%d\n", name, value);
    return 0;
}
#include <stdio.h>

#define LABEL(name) #name

int main(void) {
    int value = 5;
    const char *name = "value";

    printf("%s=%d\n", name, value);
    return 0;
}
#include <stdio.h>

#define LABEL(name) #name

int main(void) {
    int value = 8;
    const char *name = "value";

    printf("%s=%d\n", name, value);
    return 0;
}

                        
1value ← 3, name ← value⋯5int main(void) {6    int value→ 3 = 3; //@value=5, 87    const char *name→ value = "value";89    printf("%s=%d\n", namevalue, value3);10    return 0;11}⋯outputvalue=3
1value ← 5, name ← value⋯5int main(void) {6    int value→ 5 = 5;7    const char *name→ value = "value";89    printf("%s=%d\n", namevalue, value5);10    return 0;11}⋯outputvalue=5
1value ← 8, name ← value⋯5int main(void) {6    int value→ 8 = 8;7    const char *name→ value = "value";89    printf("%s=%d\n", namevalue, value8);10    return 0;11}⋯outputvalue=8