减量
#include <stdio.h>
#define MAX1 100
void main()
{
int count = MAX1 + 1;
while (--count > 0 ) {
printf("%d bttes pf spromg water on the wall " "%d botton of spring water !\n ", count,count);
printf("take one down and pass it around , \n ");
printf("%d bottles of spring water !\n ", count-1 );
}
}
自动类型转换
#include <stdio.h>
#define MAX1 100
void main()
{
char ch ;
int i ;
float f1;
f1 = i = ch ='C';
printf( "ch = %c , i = %d ,f1 = %2.2f \n",ch ,i ,f1);
ch +=1;
i = f1 +2 * ch ;
f1 =2.0 *ch +1;
printf( "ch = %c , i = %d ,f1 = %2.2f \n",ch ,i ,f1);
ch =52222.11;
printf("NOW ch = %c \n",ch);
}
定义带有一个参数的函数
#include <stdio.h>
void pound (int n)
{
while (n -- > 0) {
printf("#");
}
printf("\n");
}
void main()
{
int times = 5;
char ch = '!';
float f = 8.9;
pound( times);
pound(ch);
pound((int)f);
}
\
#include <stdio.h>
const int S_PER_M = 60;
const int S_PER_H = 3600;
const double M_PER_K = 0.62137;
int main()
{
double distk , distm;
double rate ;
int min , sec ;
int time ;
double mtime ;
int mmin , msec ;
printf("This program converts your time for a metric race \n");
printf("to a time for running a mile and to your average\n");
printf("speed in miles per hour .\n");
printf("please enter , in kilometers , the distance run .\n");
scanf("%lf",&distk );
printf("Next enter the time in minutes and seconds .\n");
printf("Begin by entering the minutes .\n");
scanf("%d",&min);
printf("Now enter the secondes \n");
scanf("%d",&sec);
time =S_PER_M * min + sec ;
distm =M_PER_K * distk ;
rate = distm / time *S_PER_H;
mtime = (double) time / distm;
mmin = (int ) mtime /distk;
mmin = (int)mtime % S_PER_M;
printf("you ran %1.2f km (%1.2f miles ) in %d min , %d sec .\n",distk ,distm ,min ,sec);
printf("that pace correponds to runing a mile in %d min",mmin);
printf("%d sec .\n your average speed was %1.2f mph .\n",msec , rate);
}
