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Why “a+++++b” can not be compiled in gcc, but “a+++b”, “a++ + ++b”, and “a+++ ++b” can be? [duplicate]

Why “a+++++b” can not be compiled in gcc, but “a+++b”, “a++ + ++b”, and “a+++ ++b” can be? [duplicate]

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Please help me understanding the error a+++++b in C

Here is is the sample code, why "a+++++b" can not be compiled , but others can be?

#include 
#include 

int main(int argc, char **argv)
{
    int a = 0;
    int b = 0;
    int c = 0;
    c = a+++b;
    printf("a+++b is: %d\n", c);

    c = a = b = 0;
    c = a++ + ++b;
    printf("a++ + ++b is: %d\n", c);

    c = b = a = 0;
    c = a+++ ++b;
    printf("a+++ ++b is: %d\n", c);

    c = b = a = 0;
    c = a+++++b;      // NOTE: Can not be compiled here.
    printf("a+++++b is: %d\n", c);

    return 0;
}

c gcc operators

задан Community 23 May 2017 в 11:50

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c gcc operators

Why “a+++++b” can not be compiled in gcc, but “a+++b”, “a++ + ++b”, and “a+++ ++b” can be? [duplicate]

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