#include <stdlib.h>
#include <stdio.h>
void fn1();
void fn2();
void fn3();
void fn4();
int main()
{
printf("this is the first sentence!\n");
atexit(fn1);
atexit(fn2);
atexit(fn3);
atexit(fn4);
printf("this is the last sentence!\n");
return 0;
}
void fn1()
{
printf("fn1\n");
}
void fn2()
{
printf("fn2\n");
}
void fn3()
{
printf("fn3\n");
}
void fn4()
{
printf("fn4\n");
}
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