練習問題の回答例

C++(better C)による回答例

FizzBuzz

#include<iostream>
using namespace std;
int main( int argc, char** argv ){
	int lim = 0;
	int i;
	sscanf( argv[ 1 ], "%d", &lim );
	for( i = 1; i <= lim; i ++ ){
		if( i % 15 == 0 ){
			printf( "FizzBuzz" );
		}else if( i % 3 == 0 ){
			printf( "Fizz" );
		}else if( i % 5 == 0 ){
			printf( "Buzz" );
		}else{
			printf( "%d", i );
		}
		printf( " " );
	}
	return 0;
}

素数判定

#include<iostream>
#include<math>
using namespace std;
int main( int argc, char** argv ){
	int lim = 0;
	int i;
	bool isPrime = true;
	sscanf( argv[ 1 ], "%d", &lim );
	for( i = 2; i < ( int )( sqrt( lim ) + 1.0 ); i ++ ){
		if(( lim % i ) == 0 ){
			isPrime = false;
			break;
		}
	}
	if( isPrime ){
		printf( "%dは素数\n", lim );
	}else{
		printf( "%dは非素数\n", lim );
	}
	return 0;
}

おまけで素数列挙

#include<iostream>
#include<math>
using namespace std;
int main( int argc, char** argv ){
	int lim = 0;
	int i, j;
	bool isPrime;
	sscanf( argv[ 1 ], "%d", &lim );
	if( lim == 0 ){
		return -1;
	}
	printf( "%d ", 2 );
	for( i = 3; i < lim; i ++ ){
		isPrime = true;
		for( j = 2; j < ( int )( sqrt( i ) + 1.0 ); j ++ ){
			if(( i % j ) == 0 ){
				isPrime = false;
				break;
			}
		}
		if( isPrime ){
			printf( "%d ", i );
		}
	}
	return 0;
}

平方根

#include<iostream>
using namespace std;
int main( int argc, char** argv ){
	double target = .0;
	double result = .0;
	double temp;
	int i, j, k;
	char *str1, *str2;

	sscanf( argv[ 1 ], "%lf", &target );
	sscanf( argv[ 2 ], "%d", &k );
	str1 = ( char* )malloc( k );
	str2 = ( char* )malloc( k );

	if( target == .0 ) return -1;
	for( i = 9; i >= 0; i -- )
		if( i * i <= ( int )( target )) break;
	sprintf( str1, "%d.", i );

	for( j = 0; j < k; j ++ ){
		for( i = 9; i >= 0; i -- ){
			sprintf( str2, "%s%d", str1, i );
			sscanf( str2, "%lf", &temp );
			if(temp * temp <= target ) break;
		}
		strcpy( str1, str2 );
	}
	sscanf( str1, "%lf", &result );
	sprintf( str2, "%%lf,%%.%dlf", k );
	printf( str2, target, result );
	return 0;
}

C++による回答

FizzBuzz

#geshi(language=cpp, number){{

#include <iostream>

#include <sstream> using namespace std;

int main( int argc, char** argv){

	unsigned long limit;
	if(argc < 2){
		cout << "Input limit > ";
		cin >> limit;
	}else{
		istringstream is(argv[1]);
		is >> limit;
	}
	for( unsigned long i = 1; i <= limit; i++ ){
		if( i % 15 == 0 ){
			cout << "FizzBuzz" << endl;
		}else if( i % 3 == 0 ){
			cout << "Fizz" << endl;
		}else if( i % 5 == 0 ){
			cout << "Buzz" << endl;
		}else{
			cout << i << endl;
		}
	}
	return 0;

} }}


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