trace call stack demo

#include <stdio.h> #include <stdlib.h> #include <time.h> #include <stdarg.h> void func0(); void func1( int ); void func2( int , int ); void func3( int , int , int ); void func0() { int a = rand() , b = rand() , c = rand(); printf( "func0\n" ); switch( rand() % 4 ) { case 0: break; case 1: func1( a ); break; case 2: func2( a , b ); break; case 3: func3( a , b , c ); break; } } void func1( int a ) { int b = rand() , c = rand(); printf( "func1 %d\n" , a ); switch( rand() % 4 ) { case 0: case 1: break; case 2: func2( a , b ); break; case 3: func3( a , b , c ); break; } } void func2( int a , int b ) { int c = rand(); printf( "func2 %d %d\n" , a , b ); switch( rand() % 4 ) { case 0: case 1: case 2: break; case 3: func3( a , b , c ); break; } } void func3( int a , int b , int c ) { printf( "func3 %d %d %d\n" , a , b , c ); switch( rand() % 4 ) { case 0: case 1: case 2: break; case 3: func3( a , b , c ); break; } } int main() { printf("main\n"); srand( time(NULL) ); func0(); return 0; }