題
//#include "stdafx.h"//vc++6.0加上這壹行.
#include "stdio.h"
void main(void){
double sum;
int i;
for(sum=0,i=1;i<22;i+=2)
sum += (i+1)&3 ? 1.0/i : -1.0/i;
printf("The result is %f\n",sum);
}
2.題
//#include "stdafx.h"//vc++6.0加上這壹行.
#include "stdio.h"
void main(void){
double sum,x;
int i;
printf("Input some data...\n");
for(x=1,sum=i=0;x>0;i++){
scanf("%lf",&x);
sum+=x;
}
printf("The total is %g\nThe average is %g\n",sum,sum/(i-1));
}
3.題//#include "stdafx.h"//vc++6.0加上這壹行.
#include "stdio.h"
void main(void){
int i,j,k;
for(i=7;i>0;i--){
printf("%*.*s",7-i,1,"");
for(j=1;j<i;printf("%d",j++));
for(j-=2;j>0;printf("%d",j--));
printf("\n");
}
}