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5 deleted 2 characters in body
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C, 4038 bytes

gcdg(x,y){while(x^=y^=x^=y%=x);return y;}

C, 40 bytes

gcd(x,y){while(x^=y^=x^=y%=x);return y;}

C, 38 bytes

g(x,y){while(x^=y^=x^=y%=x);return y;}
4 deleted 2 characters in body
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C, 40 bytes

C, 40 bytes

gcd(x,y){while(x^=y^=x^=y%=x);return y;}

C, 40 bytes

gcd(x,y){while(x^=y^=x^=y%=x);return y;}

C, 40 bytes

gcd(x,y){while(x^=y^=x^=y%=x);return y;}
3 deleted 101 characters in body
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C, 3040 bytes

gcd(x,y){while(x^=y^=x^=y%=x);return y;

just define a function for example with two intger inputs x and y:

inline int gcd(int x, int y);}

C, 30 bytes

while(x^=y^=x^=y%=x);return y;

just define a function for example with two intger inputs x and y:

inline int gcd(int x, int y);

C, 40 bytes

gcd(x,y){while(x^=y^=x^=y%=x);return y;}
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