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Create 1.cpp

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`‎20/1.cpp`

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	`1`	`+#include<bits/stdc++.h>`
	`2`	`+`
	`3`	`+usingnamespacestd;`
	`4`	`+`
	`5`	`+// 소수 판별 함수(2이상의 자연수에 대하여)`
	`6`	`+boolisPrimeNumber(int x) {`
	`7`	`+// 2부터 x의 제곱근까지의 모든 수를 확인하며`
	`8`	`+for (int i =2; i <= (int)sqrt(x); i++) {`
	`9`	`+// x가 해당 수로 나누어떨어진다면`
	`10`	`+if (x % i ==0) {`
	`11`	`+returnfalse;// 소수가 아님`
	`12`	`+ }`
	`13`	`+ }`
	`14`	`+returntrue;// 소수임`
	`15`	`+}`
	`16`	`+`
	`17`	`+intmain() {`
	`18`	`+ cout <<isPrimeNumber(4) <<'\n';`
	`19`	`+ cout <<isPrimeNumber(7) <<'\n';`
	`20`	`+}`

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