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kaityo256/test.cpp

Created July 28, 2020 10:26
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Redefined macro
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test.cpp
#include <cstdio>
#define A 1
#define B 1
#define A 1 // No warning
#define B 2 // test.cpp:7:0: warning: "B" redefined
int main() {
printf("%d %d\n", A, B);
}
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kaityo256 commented Jul 28, 2020 

$ g++ test.cpp
test.cpp:7:0: warning: "B" redefined
 #define B 2 // test.cpp:7:0: warning: "B" redefined

test.cpp:4:0: note: this is the location of the previous definition
 #define B 1

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