1、创建一个drawboard 

#import "DrawBoard1.h"

 

@implementation DrawBoard1

-(void)drawRect:(CGRect)rect{

    CGContextRef context=UIGraphicsGetCurrentContext();

 

    CGContextMoveToPoint(context,100,200);

    CGContextAddLineToPoint(context,100,400);

 

    CGContextAddCurveToPoint(context,100,400,400,250,100,200);

    CGContextMoveToPoint(context, 75, 175);

    CGContextAddLineToPoint(context,75,425);

    CGContextAddCurveToPoint(context,75,425,500,250,75,175);

    

    [[UIColor colorWithRed:1 green:1 blue:0 alpha:1]setFill];

    CGContextDrawPath(context,kCGPathEOFillStroke);

 

    CGContextAddEllipseInRect(context,CGRectMake(250,375,40,40));

    CGContextAddEllipseInRect(context,CGRectMake(235,360,70,70));

    [[UIColor colorWithRed:1 green:0 blue:0 alpha:1]setFill];

    CGContextDrawPath(context,kCGPathEOFillStroke);

    CGContextStrokePath(context);

    

}

 

 

 

 

@end

 

 

2、

n设5个同学修了高等数学﹑普通物理、程序设计语言并取得了成绩，现计算三门课总分、平均分，每门课的总分、平均分，每个同学的总分、平均分

 

 

 

#include<stdio.h>

int main(void)

{

    int math[]={

91,67,88,78,81};

    int physize[]={

87,79,81,86,67};

    int programming[]={

86,81,85,92,87};

    int all_sum=0;

    float all_average=0;

    int subject_sum[3]={

0,0,0};

    float subject_average[3];

    int student_sum[5];

    float student_average[5];

    int i=0;

        for (i=0; i<=4; i++)

        {

            student_sum[i]=math[i]+physize[i]+programming[i];

            student_average[i]=student_sum[i]/3.0;

            subject_sum[0]+=math[i];

            subject_sum[1]+=physize[i];

            subject_sum[2]+=programming[i];

            subject_average[0]=subject_sum[0]/5.0;

            subject_average[1]=subject_sum[1]/5.0;

            subject_average[2]=subject_sum[2]/5.0;

            all_sum=subject_sum[0]+subject_sum[1]+subject_sum[2];

            all_average=all_sum/5.0;

        printf("%d同学的总成绩为%d,平均成绩为%f\n",i,student_sum[i],student_average[i]);}

    printf("总成绩为%d,总平均成绩为%f\n数学总成绩为%d，数学平均成绩为%f，物理总成绩为%d，物理平均成绩为%f\n程序设计总成绩为%d，程序设计平均成绩为%f\n",all_sum,all_average,subject_sum[0],subject_average[0],subject_sum[1],subject_average[1],subject_sum[2],subject_average[2]);

    return 0;

}

 

3，对与库的理解