[C language] Test 7 function

1. The type of the following C function is ( ).
   fun (float f ){ printf ( " %f \n " , f ) ; } A. int B. float C. void D. Not sure Correct answer: A
   
   
   
   
   
   
   

2. When calling a function, if the actual parameter is a simple variable, the data transfer method between it and the corresponding formal parameter is ( ).
   A. Address transfer
   B. One-way value transfer
   C. From the actual parameter to the formal parameter, and then from the formal parameter to the actual parameter
   D. Specified by the user
   Correct answer: B

3. The type of the following function value is ( ).
   int fun(float x){ float y; y=3*x-4; return y; } A. int B. Not sure C. void D. float Correct answer: A
   
   
   
   
   
   
   
   
   

4. The output of the following program is ( ).
   #include <stdio.h>
   void fun(){ int a,b; a=100; b=200; } main(){ int a=5,b=7; fun(); printf(“%d%d \n”,a,b); } A. 100200 B. 57 C. 200100 D. 75 Correct answer: B
   
   
   
   
   
   
   
   
   
   
   
   
   
   

5. The error in the following statement is ( ).
   A. There can be no return statement in the user-defined function
   B.