哪些你容易忽略的C语言基础知识
1、C语言打印一条语句
源代码：
/* C Program to print a sentence. */
#include <stdio.h>
int main()
{
printf("C Programming"); /* printf() prints the content inside quotation */
return 0;
}
输出：
C Programming
2、C语言打印用户输入的一个整数
#include <stdio.h>
int main()
{
int num;
printf("Enter a integer: ");
scanf("%d",&num); /* Storing a integer entered by user in variable num */
printf("You entered: %d",num);
return 0;
}
输出：
Enter a integer: 25
You entered: 25
3、C语言实现两个整数相加
/*C programming source code to add and display the sum of two integers entered by user */
#include <stdio.h>
int main( )
{
int num1, num2, sum;
printf("Enter two integers: ");
scanf("%d %d",&num1,&num2); /* Stores the two integer entered by user in variable num1 and num2 */
sum=num1+num2; /* Performs addition and stores it in variable sum */
printf("Sum: %d",sum); /* Displays sum */
return 0;
}
输出：
Enter two integers: 12
11
Sum: 23
/*C program to multiply and display the product of two floating point numbers entered by user. */
#include <stdio.h>
int main( )
{
float num1, num2, product;
printf("Enter two numbers: ");
scanf("%f %f",&num1,&num2); /* Stores the two floating point numbers entered by user in variable num1 and num2 respectively */
product = num1*num2; /* Performs multiplication and stores it */
printf("Product: %f",product);
return 0;
}
输出：
Enter two numbers: 2.4
1.1
Product: 2.640000
5、C语言查找字符的ASCII值
/* Source code to find ASCII value of a character entered by user */
#include <stdio.h>
int main(){
char c;
printf("Enter a character: ");
scanf("%c",&c); /* Takes a character from user */
printf("ASCII value of %c = %d",c,c);
return 0;
}
输出：
Enter a character: G
ASCII value of G = 71
6、C语言根据用户输入的整数做商和余数
/* C Program to compute remainder and quotient */
#include <stdio.h>
int main(){
int dividend, divisor, quotient, remainder;
printf("Enter dividend: ");
scanf("%d",÷nd);
printf("Enter divisor: ");
scanf("%d",&divisor);
quotient=dividend/divisor; /* Computes quotient */
remainder=dividend%divisor; /* Computes remainder */
printf("Quotient = %d\n",quotient);
printf("Remainder = %d",remainder);
return 0;
}
输出：
Enter dividend: 25
Enter divisor: 4
Quotient = 6
Remainder = 1
7、C语言获取整型、单精度浮点型、双精度浮点型和字符型的长度
基本语法：
/* This program computes the size of variable using sizeof operator.*/
#include <stdio.h>
int main(){
int a;
float b;
double c;
char d;
printf("Size of int: %d bytes\n",sizeof(a));
printf("Size of float: %d bytes\n",sizeof(b));
printf("Size of double: %d bytes\n",sizeof(c));
printf("Size of char: %d byte\n",sizeof(d));
return 0;
}
输出：
Size of int: 4 bytes
Size of float: 4 bytes
Size of double: 8 bytes
Size of char: 1 byte
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