（四）流程控制ifelse

本文主要是介绍（四）流程控制ifelse，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

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if else

用法

if(条件表达式成立或为真){
//执行里面
}else{
//否则执行这里面
}
这里:条件表达式成立或为真，数值上就是为1

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示例1

#include <stdio.h>int main()
{int money = 0;printf("这是一个if else的程序\n");puts("请问您有多少钱");scanf("%d",&money);	if(money>=100){printf("富哥\n");}else{puts("谈话结束	");}return 0;
}

演示1

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示例2

#include <stdio.h>int main()
{int atHomeOrNot = 0;printf("这是if else 程序\n");printf("在家为1，不在家为0，\n");scanf("%d",&atHomeOrNot);if(atHomeOrNot==1){printf("我去找你玩\n");}else{printf("那算啦\n");}return 0 ;
}

演示2

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示例3

经典俩数交换

#include <stdio.h>int main()
{int data1,data2,tmp;printf("这是一个if else 的示例3\n");printf("请输入俩个数字\n");scanf("%d%d",&data1,&data2);if(data1<data2){tmp = data1;data1 = data2;data2 = tmp;}printf("输入的俩数字，大数为%d，小数为%d\n",data1,data2);return 0;
}

演示3

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示例4

三数交换

#include <stdio.h>int main()
{int data1,data2,data3,tmp;printf("这是一个if else 的示例3\n");printf("请输入三个数字\n");scanf("%d%d%d",&data1,&data2,&data3);if(data1<data2){tmp = data1;data1 = data2;data2 = tmp;	}	if(data1<data3){tmp = data1;data1 = data3;data3 = tmp;	}	if(data2<data3){tmp = data2;data2 = data3;data3 = tmp;	}printf("输入的三个数字，大数为%d，中间的数为%d ，小数为%d\n",data1,data2,data3);return 0;
}

演示4

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逻辑与或非

示例1

#include <stdio.h>int main()
{int a ,b;printf("逻辑与或非的程序\n");puts("请输入a,b两个数");scanf("%d%d",&a,&b);if(a ==1 && b==1){printf("逻辑与成功\n");		}if(a ==1 || b ==0){printf("逻辑或成功\n");}if(!a){printf("逻辑非成功\n");}return 0;
}

演示1

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示例2

#include <stdio.h>int main()
{int haveMoneyYesOrNot ,handSomeYesOrNot;printf("逻辑与或非的程序\n");puts("你有钱吗？有的扣1，没有扣0");scanf("%d",&haveMoneyYesOrNot);puts("你帅吗，帅的扣1，不帅扣0");scanf("%d",&handSomeYesOrNot);if(haveMoneyYesOrNot ==1 && handSomeYesOrNot==1){printf("哇塞，我要嫁给你\n");		}else{printf("对不起我们不合适\n");}puts("相亲结束");return 0;
}

演示2

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示例3

#include <stdio.h>int main()
{int haveMoneyYesOrNot ,handSomeYesOrNot;int healthyYesOrNot;printf("逻辑与或非的程序\n");puts("你身体好嘛？好的扣1，不好的扣0");scanf("%d",&healthyYesOrNot);if(!healthyYesOrNot){printf("身体不行，我们不合适\n");return -1;}puts("你有钱吗？有的扣1，没有扣0");scanf("%d",&haveMoneyYesOrNot);puts("你帅吗，帅的扣1，不帅扣0");scanf("%d",&handSomeYesOrNot);if(haveMoneyYesOrNot ==1 && handSomeYesOrNot==1){printf("哇塞，我要嫁给你\n");		}else{printf("对不起我们不合适\n");}puts("相亲结束");return 0;
}

演示3

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if elseif else

示例1

#include <stdio.h>int main()
{char cdata;puts("这是一个if else嵌套的程序");puts("请输入一个字母");cdata = getchar();//大写直接输出，小写变成大写再输出，其他字符不符合if(cdata>=97 && cdata<=122){printf("%c",cdata);}else if(cdata>=65 && cdata<=90){printf("%c",cdata+32);}else{printf("请输入正确的字母\n");	}return 0;
}

演示1

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示例2

#include <stdio.h>int main()
{int healthyYesOrNot;	int haveMoneyYesOrNot;	int handsomeYesOrNot;int generosityYesOrNot;puts("你身体好吗?(tips:好的话扣1，不好扣0)");scanf("%d",&healthyYesOrNot);if(healthyYesOrNot==1){puts("你有钱不?你帅不？(tips:输入两个数字，0和1)");scanf("%d%d",&haveMoneyYesOrNot,&handsomeYesOrNot);if(haveMoneyYesOrNot==1 && handsomeYesOrNot==1){puts("你愿意为我花钱吗？(tips:愿意扣1，不愿意扣0)");scanf("%d",&generosityYesOrNot);if(generosityYesOrNot==1){printf("亲亲\n");}else{printf("切，我不要跟小气鬼在一起，虽然你有钱又帅又有身体，但请滚蛋\n");}}else{printf("我要又帅又有钱的");}	}else{printf("对不起，我们适合做朋友\n");}return 0;
}

演示2

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