project01
#include <stdio.h>
int main(void)
{
printf(" *\n");
printf(" *\n");
printf(" *\n");
printf(" *\n");
printf(" * *\n");
printf(" * *\n");
printf(" *\n");
return 0;
}
#include <stdio.h>
int main(void) {
printf(" *\n");
printf(" * \n");
printf(" * \n");
printf("* * \n");
printf(" * * \n");
printf(" * \n");
return 0;
}
project02
#include <stdio.h>
#define SCALLE_FACTOR (4.0f / 3.0f)
#define PI 3.141592653f
int main(void)
{
int radius = 10;
float volume;
volume = SCALLE_FACTOR * radius * radius * radius * PI;
printf("Volume: %.2f\n", volume);
return 0;
}
#include <stdio.h>
int main(void) {
printf("Sphere volume: %.2f cubic meters\n", 4.0f/3.0f * 3.14f * 1000);
return 0;
}
project03
#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#define SCALLE_FACTOR (4.0f / 3.0f)
#define PI 3.141592653f
int main(void)
{
int radius;
float volume;
printf("Enter the radius: ");
scanf("%d", &radius);
volume = SCALLE_FACTOR * radius * radius * radius * PI;
printf("Volume: %.2f\n", volume);
return 0;
}
存在问题：
为什么输入与输出分开显示在两行，但输出的语句与输入的语句之间却没有换行？？
#include <stdio.h>
int main(void) {
int r = 0;
printf("Enter radius: ");
scanf("%d", &r);
printf("\nSphere volume: %.2f cubic meters\n",
4.0f/3.0f * 3.14f * r * r * r);
return 0;
}
project04
#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#define RATE 0.05
int main(void)
{
int amount;
float tax_added;
printf("Enter a amount: ");
scanf("%d", &amount);
tax_added = (float)(amount * (1 + RATE));
printf("With tax added: $%.2f\n", tax_added);
return 0;
}
存在问题：
1也是常量，应该用宏定义
涉及到强制类型转换，好还是不好？
多定义了一个变量，增加了存储空间
#include <stdio.h>
int main(void) {
float money = 0.0f;
printf("Enter an amount: ");
scanf("%f", &money);
printf("With tax added: $%.2f\n", money * 1.05f);
return 0;
}
project05
#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
int main(void)
{
int x;
printf("Enter x: ");
scanf("%d", &x);
printf("3x^5+2x^4-5x^3-x^2+7x-6 = %d\n",
3*x*x*x*x*x + 2*x*x*x*x + 5*x*x*x - x*x + 7*x - 6);
return 0;
}
#include <stdio.h>
int main(void) {
int x = 0;
printf("Enter value for x: ");
scanf("%d", &x);
printf("Result: %d\n",
(3 * x * x * x * x * x) + (2 * x * x * x * x) - (5 * x * x * x)
- (x * x) + (7 * x) - 6);
return 0;
}
project06
#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
int main(void)
{
int x;
printf("Enter x: ");
scanf("%d", &x);
printf("3x^5+2x^4-5x^3-x^2+7x-6 = %d\n",
((((3*x + 2)*x - 5)*x - 1)*x + 7)*x - 6);
return 0;
}
#include <stdio.h>
int main(void) {
int x = 0;
printf("Enter value for x: ");
scanf("%d", &x);
printf("Result: %d\n",
((((3 * x + 2) * x - 5) * x - 1) * x + 7) * x - 6);
return 0;
}
project07
#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
int main(void)
{
int money;
int dollar_20, dollar_10, dollar_5, dollar_1;
printf("Enter a dollar amount: ");
scanf("%d", &money);
dollar_20 = money / 20;
dollar_10 = (money - dollar_20 * 20) / 10;
dollar_5 = (money - dollar_20 * 20 - dollar_10 * 10) / 5;
dollar_1 = money - dollar_20 * 20 - dollar_10 * 10 - dollar_5 * 5;
printf("$20 bills: %d\n", dollar_20);
printf("$10 bills: %d\n", dollar_10);
printf(" $5 bills: %d\n", dollar_5);
printf(" $1 bills: %d\n", dollar_1);
return 0;
}
存在问题：
把存储输入数据的变量看成是一个不变的量了
#include <stdio.h>
int main(void) {
int money = 0;
printf("Enter a dollar amount: ");
scanf("%d", &money);
printf("$20 bills: %d\n", money/20);
money -= 20 * (money/20);
printf("$10 bills: %d\n", money/10);
money -= 10 * (money/10);
printf(" $5 bills: %d\n", money/5);
money -= 5 * (money/5);
printf(" $1 bills: %d\n", money);
return 0;
}
project08
#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
int main(void)
{
float amountOfLoan, interestRate, monthlyPayment;
float afterFirstPayment, afterSecondPayment, afterThridPayment;
printf("Enter amount of loan:");
scanf("%f", &amountOfLoan);
printf("Enter interest rate:");
scanf("%f", &interestRate);
printf("Enter monthly payment:");
scanf("%f", &monthlyPayment);
afterFirstPayment = amountOfLoan + amountOfLoan * (interestRate / 100 / 12) - monthlyPayment;
afterSecondPayment = afterFirstPayment + afterFirstPayment * (interestRate / 100 / 12) - monthlyPayment;
afterThridPayment = afterSecondPayment + afterSecondPayment * (interestRate / 100 / 12) - monthlyPayment;
printf("Balance remaining after first payment: $%0.2f\n", afterFirstPayment);
printf("Balance remaining after second payment: $%0.2f\n", afterSecondPayment);
printf("Balance remaining after third payment: $%0.2f\n", afterThridPayment);
return 0;
}
存在问题：
同第7题同样的错误
#include <stdio.h>
int main(void) {
float loan = 0.0f,
rate = 0.0f,
payment = 0.0f;
printf("Enter amount of loan: ");
scanf("%f", &loan);
printf("Enter interest rate: ");
scanf("%f", &rate);
printf("Enter monthly payment: ");
scanf("%f", &payment);
loan = loan - payment + (loan * rate / 100.0 / 12.0);
printf("Balance remaining after first payment: $%.2f\n", loan);
loan = loan - payment + (loan * rate / 100.0 / 12.0);
printf("Balance remaining after second payment: $%.2f\n", loan);
loan = loan - payment + (loan * rate / 100.0 / 12.0);
printf("Balance remaining after third payment: $%.2f\n", loan);
return 0;
}
