C語言基礎知識集錦
懂編程語言，有寫一些項目的經驗，能夠看懂一些比較復雜項目的代碼對我們是十分有幫助的，下面小編為大家整理了一些C語言基礎知識，一起來看看吧：
1、C語言檢查是元音還是輔音
#include
int main(){
char c;
printf("Enter an alphabet: ");
scanf("%c",&c);
if(c=='a'||c=='A'||c=='e'||c=='E'||c=='i'||c=='I'||c=='o'||c=='O'||c=='u'||c=='U')
printf("%c is a vowel.",c);
else
printf("%c is a consonant.",c);
return 0;
}
輸出1：
Enter an alphabet: i
i is a vowel.
輸出2：
Enter an alphabet: G
G is a consonant.
也可以用條件運算符解決
/* C program to check whether a character is vowel or consonant using conditional operator */
#include
int main(){
char c;
printf("Enter an alphabet: ");
scanf("%c",&c);
(c=='a'||c=='A'||c=='e'||c=='E'||c=='i'||c=='I'||c=='o'||c=='O'||c=='u'||c=='U') ? printf("%c is a vowel.",c) : printf("%c is a consonant.",c);
return 0;
}
輸出結果和上面的程序相同。
2、C語言實現從三個數值中查找最大值
實現1：
/* C program to find largest number using if statement only */
#include
int main(){
float a, b, c;
printf("Enter three numbers: ");
scanf("%f %f %f", &a, &b, &c);
if(a>=b && a>=c)
printf("Largest number = %.2f", a);
if(b>=a && b>=c)
printf("Largest number = %.2f", b);
if(c>=a && c>=b)
printf("Largest number = %.2f", c);
return 0;
}
實現2：
/* C program to find largest number using if...else statement */
#include
int main(){
float a, b, c;
printf("Enter three numbers: ");
scanf("%f %f %f", &a, &b, &c);
if (a>=b)
{
if(a>=c)
printf("Largest number = %.2f",a);
else
printf("Largest number = %.2f",c);
}
else
{
if(b>=c)
printf("Largest number = %.2f",b);
else
printf("Largest number = %.2f",c);
}
return 0;
}
實現3：
/* C Program to find largest number using nested if...else statement */
#include
int main(){
float a, b, c;
printf("Enter three numbers: ");
scanf("%f %f %f", &a, &b, &c);
if(a>=b && a>=c)
printf("Largest number = %.2f", a);
else if(b>=a && b>=c)
printf("Largest number = %.2f", b);
else
printf("Largest number = %.2f", c);
return 0;
}
輸出結果相同：
Enter three numbers: 12.2
13.452
10.193
Largest number = 13.45
3、C語言解一元二次方程
/* Program to find roots of a quadratic equation when coefficients are entered by user. */
/* Library function sqrt() computes the square root. */
#include
#include /* This is needed to use sqrt() function.*/
int main()
{
float a, b, c, determinant, r1,r2, real, imag;
printf("Enter coefficients a, b and c: ");
scanf("%f%f%f",&a,&b,&c);
determinant=b*b-4*a*c;
if (determinant>0)
{
r1= (-b+sqrt(determinant))/(2*a);
r2= (-b-sqrt(determinant))/(2*a);
printf("Roots are: %.2f and %.2f",r1 , r2);
}
else if (determinant==0)
{
r1 = r2 = -b/(2*a);
printf("Roots are: %.2f and %.2f", r1, r2);
}
else
{
real= -b/(2*a);
imag = sqrt(-determinant)/(2*a);
printf("Roots are: %.2f+%.2fi and %.2f-%.2fi", real, imag, real, imag);
}
return 0;
輸出1：
Enter coefficients a, b and c: 2.3
4
5.6
Roots are: -0.87+1.30i and -0.87-1.30i
輸出2：
Enter coefficients a, b and c: 4
1
0
Roots are: 0.00 and -0.25
4、C語言檢查是否是閏年
/* C program to check whether a year is leap year or not using if else statement.*/
#include
int main(){
int year;
printf("Enter a year: ");
scanf("%d",&year);
if(year%4 == 0)
{
if( year%100 == 0) /* Checking for a century year */
{
if ( year%400 == 0)
printf("%d is a leap year.", year);
else
printf("%d is not a leap year.", year);
}
else
printf("%d is a leap year.", year );
}
else
printf("%d is not a leap year.", year);
return 0;
}
輸出1：
Enter year: 2000
2000 is a leap year.
輸出2：
Enter year: 1900
1900 is not a leap year.
輸出3：
Enter year: 2012
2012 is a leap year.
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