题目内容

Function definition cannot be nested.

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You can output a string with "%c".

The called function can only be defined before the main() function.

Pointer variables can also point to a string.

#includeint f(int x,int y) { return ((y-x)*x); } main() { int a=3,b=4,c=5,d; d=f(f(a,b),f(a,c)); printf("%d\n",d); } The output of the program is ( ).

A. 10
B. 9
C. 8
D. 7