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int
.
int main() { int i = foo(5); /* No declaration for `foo`, no prototype for `foo`. Will work in C89/90. Assumes `int foo(int)` */ return 0;}int foo(int i) { return i;}
int
foo
int foo(); /* Declares `foo`, but still no prototype */int main() { int i = foo(5); /* No prototype for `foo`, although return type is known. Will work in C99. Assumes `int foo(int)` */ return 0;}...
另一份说明:printf
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