第三章

1.
#include <stdio.h>
int main(void) {
 int input;
 printf("Enter a value of char int ASCII:");
 scanf("%d",&input);
 printf("You input value is %d,and char is %c\n",input,input);
 getchar();
 return 0;
}

2.
#include <stdio.h>
int main(void) {
 char ch = '\a';
 printf("%c",ch);
 printf("Starled by the sudden sound,Sally shouted, \n");
 printf("\"By the Great Pumpkin,what was that!\"\n");
 getchar();
 return 0;
}
3.
#include <stdio.h>
int main(void) {
 float input;
 printf("Enter a floating-point value:");
 scanf("%f",&input);
 printf("fixed-point notation: %f \n",input);
 printf("exponential notation: %f \n",input);
 printf("p notation: %a \n",input);
 getchar();
 return 0;
 }
 4.
 #include <stdio.h>
#define SEC_PER_YEAR 3.156e7
int main(void) {
 float second,year;
 printf("Enter how many years old you are:");
 scanf("%f",&year);
 second = year*SEC_PER_YEAR;
 printf("You are: %1f years old. \n",year);
 printf("And you are %e seconds old,too. \n",second);
 getchar();
 return 0;
}
5.
#include <stdio.h>
#define MASS_PER_MOLE 3.0e-23
#define MASS_PER_QUART 950
int main(void) {
 float quart,quantity;
 printf("Enter how many quart:");
 scanf("%f",&quart);
 quantity = quart*MASS_PER_QUART/MASS_PER_MOLE;
 printf("There are %e molecule. \n",quantity);
 getchar();
 return 0;
}
6.
#include <stdio.h>
#define INCH_TO_CM 2.54
int main(void) {
 float inch,cm;
 printf("Enter the inch of your heigh:");
 scanf("%f",&inch);
 cm = inch*INCH_TO_CM;
 printf("HI,your are %0.2f inch, or %.2f cm heigh\n",inch,cm);
 getchar();
 return 0;
 }
 7.
 #include<stdio.h>
#include<stdlib.h>
#define PINT_CUP 2
#define CUP_OUNCE 8
#define OUNCE_SPOON 2
#define SPOON_TEA 3
int main(void){
	float pint,cup,ounce,spoon,tea_spoon;
	printf("Enter how many cup:");
	scanf("%f",&cup);
	pint = cup/PINT_CUP;
	ounce = cup*CUP_OUNCE;
	spoon = ounce*OUNCE_SPOON;
	spoon = ounce*SPOON_TEA;
	tea_spoon = spoon*SPOON_TEA;
	printf("%.lf cup equals %.lf pint, %.lf ounce, %.lf spoon, %.lf tea_spoon.\n",cup,pint,ounce,spoon,tea_spoon);
	system("pause");
	return 0;
}

来源：oschina

链接：https://my.oschina.net/u/4774092/blog/4864201