Is f(int &x) a valid call-by-reference syntax in C?

#include<stdio.h>

int f(int *,int);

int main()
{
int num1,num2,*ptr=&num1;
num1=5;
num2=f(ptr,num1);
printf(“Answer is %d”,num2);

}

int f(int &x,int c){
c=c-1;
if(c==0) return 1;
x=x+1;
return f(x,c)*x;
}

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