C言語プログラム設計現代方法第二版、第七章授業後のプログラミング練習問題

第四題

#include 
#include

int main(void)
{
	int ch;
	printf("Enter phone number: ");

	while ((ch = getchar()) != '
') 
	{
		if (ch <= 'Z' && ch >= 'A')
		{
			switch (ch)
			{
			case 65: case 66: case 67:
				printf("2");break;
			case 68: case 69: case 70:
				printf("3");break;
			case 71: case 72: case 73:
				printf("4");break;
			case 74: case 75: case 76:
				printf("5");break;
			case 77: case 78: case 79:
				printf("6");break;
			case 81: case 82: case 83: case 80:
				printf("7");break;
			case 84: case 85: case 86: case 87:
				printf("8");break;
			case 88: case 89: case 90:
				printf("9");break;
			}
			continue;
		}
		putchar(ch);
	}
	system("pause");
	return 0;
}

第五題は大文字だけを書いた.

#include 
#include

int main(void)
{
	int ch, sum = 0;
	printf("Enter a word: ");
	while ((ch = getchar()) != '
') 
	{
			switch (ch)
			{
			case 65: case 69: case 73:case 76: case 78: case 79: case 82: case 83: case 84: case 85:
				sum += 1; break;
			case 68: case 71:
				sum += 2;break;
			case 66: case 67: case 77: case 80:
				sum += 3;break;
			case 70: case 72: case 86:case 87: case 89:
				sum += 4; break;
			case 75:
				sum += 5;break;
			case 74: case88:
				sum += 8;break;
			case 81: case 90:
				sum += 10; break;
			}
			//continue;
	}
	printf("Scarabble value: %d
",sum);
	system("pause");
	return 0;
}

第六題

#include 
#include

int main(void)
{
	printf("int:%d
", sizeof(int));
	printf("short:%d
", sizeof(short));
	printf("long:%d
", sizeof(long));
	printf("float:%d
", sizeof(float));
	printf("double:%d
", sizeof(double));
	printf("long double:%d
", sizeof(long double));
	system("pause");
	return 0;
}

第七題

#include 
#include

int main(void)
{
	int a1, a2, b1, b2, c1, c2;
	char ch;
	printf("Enter two fractions separated by a plus sign:");
	scanf_s("%d/%d%c%d/%d", &a1, &a2,&ch, &b1, &b2);
	if (ch == '+')
	{
		c1 = a1*b2 + b1*a2;
		c2 = a2*b2;
	}
	else if (ch == '-')
	{
		c1 = a1*b2 - b1*a2;
		c2 = a2*b2;
	}
	else if (ch == '*')
	{
		c1 = a1*b1;
		c2 = a2*b2;
	}
	else if (ch == '/')
	{
		c1 = a1*b2;
		c2 = a2*b1;
	}
	else
		printf("ERRO"); 
	printf("The result is: %d/%d
", c1, c2);
	system("pause");
	return 0;
}

第8題第9題

#include 
#include
#include 
int main(void)
{
	int h, m;
	char ch,ch1;
	printf("Enter a 12-hour time:");
	scanf_s("%d:%d %c%c",&h,&m,&ch,1,&ch1,1);
	if (toupper(ch) == 'P')
		h += 12;
	printf("Equivalalent 24-hour time:%d:%d ", h, m);
	system("pause");
	
	   
	

#include #include #include int main(void) { int ch,sum = 0; printf(“Enter a sentence:”); while ((ch=toupper(getchar())) != ‘’) { if (ch == ‘A’ || ch == ‘E’ || ch == ‘I’ || ch == ‘O’ || ch == ‘U’) sum += 1; } printf(“ssssss %d”, sum); system(“pause”); return 0; }
第十一題

#include 
#include
#include 
int main(void)
{
	int ch,ch1,i=0,sum = 0;
	printf("Enter a sentence:");
	ch1 = toupper(getchar());
	while ((ch=getchar()) != '
')
	{
		if (ch == ' ' || i == 1)
		{
			printf("%c", ch);
			i = 1;
		}
	}
	printf( ",%c
", ch1);
	system("pause");
	return 0;
}

#include #include #include int main(void) { float a,b; int ch; printf(“Enter:”); scanf("%f", &a); while ((ch = getchar()) != ‘’) { scanf("%f", &b); switch (ch) { case ‘+’: a = a + b;break; case ‘-’: a = a - b;break; case ‘*’: a = a * b;break; case ‘/’: a = a/b; break; } } printf("%f", a); system(“pause”); return 0; }

#include #include #include int main(void) { float i=0,j=0; float r; int ch; printf(“Enter:”); while ((ch = getchar()) != ‘’) { if (ch == ’ ') i++; else j++; } r =j/(i + 1); printf("%.2f", r); system(“pause”); return 0; }

#include #include #include int main(void) { double y=1, y1=0,y2=1; float x; printf(“Enter x:”); scanf("%f", &x); printf(“Enter y:”); scanf("%f", &y); while (fabs(y2 - y1) >= (0.00001*y1)) { y2 = y; y = (y + x/y)/2;

}
printf("%f",y1);
system("pause");
return 0;

}