ex05_47.c

C程序设计经典教程第5版程序示例,比较适合初级c语言的学生

/* ex05_47.c */
/* What does this program do? */
#include <stdio.h>

int mystery( int a, int b ); /* function prototype */
 
/* function main begins program execution */  
int main( void )
{
   int x; /* first integer */
   int y; /* second integer */
   
   printf( "Enter two integers: " );
   scanf( "%d%d", &x, &y );

   printf( "The result is %d\n", mystery( x, y ) );
   
   return 0; /* indicates successful termination */

} /* end main */

/* Parameter b must be a positive integer 
   to prevent infinite recursion */
int mystery( int a, int b )
{
   /* base case */
   if ( b == 1 ) {
      return a;
   } /* end if */
   else { /* recursive step */
      return a + mystery( a, b - 1 );
   } /* end else */
   
} /* end function mystery */

 

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