C语言全局变量和数组的应用

全局变量的应用：

#include

double cash;

int main(void)

{

     int choice;

     double value;

     void income (number),expend (number);

     cash=0;

     printf ("Enter operate choice(0--end,1--income,2--expend):");

     scanf ("%d",&choice");

     while (choice!=0){

            if (choice==1 || choice==2){

                   printf ("Enter cash value:");

                   scanf ("%lf",&value);

            if (choice==1){

                   income(value);

         } else{

                   expend(value);

             }    

           printf ("Current cash=%.2fn",&cash);

       } 

           printf ("Enter operate choice(0--end,1--income,2--expend):");

           scanf ("%d",&choice);

 }

return 0;

}

void income(double number){

           cash=cash+number;

}

void expend(double number){

           cash=cash-number;

}

数组的应用：

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#include

int main()
{
	int i,n;
	double average,sum;
	int a[10];
	printf("Enter n:");
	scanf("%d",&n);
	if(n>=1 && n<=10){
		printf("Enter %d integers:",n);
		for(i=1;i<=n;i++){
			scanf("%d",&a[i]);
		}
		sum=0;
		for(i=1;i<=n;i++){
			sum+=a[i];
		}
		average=sum/n;
		printf("average=%.2fn",average);
		printf(">average:");
		for(i=1;i<=n;i++){
			if(a[i]>average){
				printf("%d",a[i]);
			}
		}
		printf("n");
	}
	return 0;
}

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