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programming-contest/phiFunction.cpp at master · AshHasib/programming-contest · GitHub
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#
include
<
bits/stdc++.h
>
using
namespace
std
;
int
gcd
(
int
a,
int
b)
{
if
(b==
0
)
return
a;
else
return
gcd
(b,a%b);
}
int
phi
(
int
n)
{
int
res=
1
;
for
(
int
i=
2
;i<n;i++)
{
if
(
gcd
(n,i)==
1
)
{
res++;
}
}
return
res;
}
int
main
()
{
int
num;
printf
(
"
Enter a number:
"
);
scanf
(
"
%d
"
,&num);
printf
(
"
Phi(%d) = %d
\n
"
,num,
phi
(num));
return
0
;
}
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