c教学培训课件ch1.ppt

C程序设计快速进阶大学教程 * * 参考答案 #includestdio.h int main() { int iMath, iChinese, iEng; /* 定义变量，分别存储数学、语文、英语成绩 */ iMath = iChinese = iEng = 0; /* 初始化 */ float fAvg = 0.0; /* 定义变量，三门成绩的平均分 */ printf(Please input the score of math(0 ~ 100):); scanf(%d, iMath); while(iMath 0 || iMath 100) /* 输入数据有效性检测 */ { printf(You have input wrong score, please input again:); scanf(%d, iMath); } printf(Please input the score of Chinese(0 ~ 100):); scanf(%d, iChinese); while(iChinese 0 || iChinese 100) /* 输入数据有效性检测 */ { printf(You have input wrong score, please input again:); scanf(%d, iChinese); } printf(Please input the score of English(0~100):); scanf(%d, iEng); while(iEng 0 || iEng 100) /* 输入数据有效性检测 */ { printf(You have input wrong score, please input again:); scanf(%d, iEng); } fAvg = (iMath + iChinese + iEng) / 3.0; /* 计算平均分 */ printf(The average score is %.2f \n, fAvg); return 0; } C程序设计快速进阶大学教程 * * 参考答案 #includestdio.h int main() { int iMath, iChinese, iEng; /* 定义变量存储三科成绩 */ iMath = iChinese = iEng = 0; /* 初始化 */ printf(Please input the scores of math, Chinese, English(0 ~ 100):); scanf(%d %d %d, iMath, iChinese, iEng); int flag = 0; /* 定义一个标记变量，用于下面的while循环条件 */ while(flag == 0) /* 检测输入成绩的合法性，当标记变量不等于1时，执行循环体 */ { if(iMath 0 || iMath 100) { printf(You have input wrong score of math, please input it again:); scanf(%d, iMath); } else if(iChinese 0 || iChinese 100) { printf(You have input wrong score of Chinese, please input it again:); scanf(%d, iChinese); } else if(iEng 0 || iEng 100) { printf(You have input wrong score of English, please input it again:); scanf(%d, iEng); } else flag = 1; /* 当三科成绩都是在合法范围内时，标记变量置为1 */ } if(iMath 98 iChinese 98 iEng 98) /*