C语言学习记录3

#include <stdio.h>
int main(void)
{
	char beep=7;
	printf("%c",beep);
	printf("startled by the sudden sound,sally shouted,\n");
	printf("\"by the ggreat pumpkin,wahat was that!\""); }

%d      int
%ld     long int
%c      char
%f      float
%u      unsigned
%hd     short
%lf     double
%x      以16进制输出int or long int or short int  
%o      八进制输出 
%s      字符串 

#include <stdio.h>
int main(void)
{
	
	float a=64.25;
	printf("enter a floating-point value:64.25\n");
	printf("exponential notation: %e\n",a);
	printf("fixed-point notation:%f\n",a);
	return 0;
}

#include <stdio.h>
int main(void)
{
	
	float a;
	printf("enter a floating-point value:");
	scanf("%f",&a);
	printf("exponential notation: %e\n",a);
	printf("fixed-point notation:%f\n",a);
	return 0;
}

#include <stdio.h>
#define ADJUST 7.31
int main()
{
	const double SCALE=0.333;  //const 常量
	double shoe,foot;
	printf("Shoe size (men's)  foot length\n");
	shoe=3.0;
	while (shoe<18.5)   //while循环开始 
	{                   /*块开始*/ 
		foot=SCALE*shoe+ADJUST;
		printf("%10.lf %15.2f inches\n",shoe,foot);
		shoe=shoe+1.0;
		
	 }                 //块结束 
	 printf("if the shoe fits,wear it.\n");
	 return 0;
}

#include <stdio.h>
#define ADJUST 7.31
int main()
{
	int a=0;
	int b;
	while (a<10)
	{
		a=a+1;
		b=a*a;
	    printf("%4d %6d\n",a,b);
	
	}
		
	return 0;
}

#include <stdio.h>
#define SQUARES 10
int main()
{
	const double CROP=2E16;
	double current,total;
	int count=1;
	printf("square    grains      total   ");
	printf("     fraction of \n");
	printf("          added       grains    ");
	printf("   world total\n");
	total=current=1.0;
	printf("%4d %13d %12.2e %12.2e\n",count,current,total,total/CROP);
	while (count<SQUARES)
	{
		count=count+1;
		current=2.0*current;
		total=total+current;
		printf("%4d %13.2e %12.2e %12.2e\n",count,current,total,total/CROP);
		
	}
	printf("That's all.\n");
	getchar();
		
	return 0;
}

#include <stdio.h>
#define sec_min 60
int main()
{
	int min,sec,left;
	printf("convert second to minute and second\n");
	printf("please input the seconds:\n");
	scanf("%d",&sec);
	while (sec>0)
	{
			min=sec/sec_min;
	        left=sec%sec_min;
	        printf("%d seconds is %d minutes and %d seconds\n",sec,min,left);
	        printf("please input another seconds:\n");
	        scanf("%d",&sec);
	}

	printf("Done!\n");
	return 0;
}