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include

int func (int n) {
if (n<= 0) {
return 0;
}
else {
return n + func (n-1) + func (n-2);
}
}
int main (void) {
printf ("% d \ n", func (3));
return 0;
}
And the error is prog.c: In function ‘func’:
prog.c: 4: 3: error: stray ‘\ 343’ in program
return 0;
How can I fix it?
C language

c