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#include <stdio.h>
int fatIter(int n);
int fatRec(int n);
int executa(int (*pt)(int),int);
int main()
{
    int n;
    printf("n=");scanf("%d",&n);
    printf("!%d=%d",n,executa(fatIter,n));
    printf("!%d=%d",n,executa(fatRec,n));
    return 0;
}

int fatRec(int a){
    if(a==1){
        return a;
    }
    return a*fatRec(a-1);
    
}

int fatIter(int a){
    
    int fat=1;
    while(a>1){
        fat=fat*a;
        --a;
    }
    
    return fat;
}

int executa(int (*pt)(int), int a){
    return pt(a);
}