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;
}