累加求和

···

include <stdio.h>

int main(){
int i = 1;
int sum = 0;
do{
if(i%2 != 0){
sum += i;
}
++i;
}while(i != 101);
printf("总和为:%d\n",sum);
return 0;
}

累加求和（二）

include <stdio.h>

int main(){
int i = 1;
int sum = 0;
do{
if(i%2 == 0){
sum += i;
}
++i;
}while(i != 101);
printf("总和为:%d\n",sum);
return 0;
}

累加求和（三）

include <stdio.h>

int main(){
int sum = 0,count = 0,bool_cin = 1;
while(bool_cin){
int num = 0;
printf("请输入一个整数\n");
scanf("%d",&num);
sum += num;
++count;
printf("是否继续?yes->1 no->0\n");
scanf("%d",&bool_cin);
}
double ave = (double)sum/count;
printf("和为%d,平均值为%.2g\n",sum,ave);
return 0;
}

四

include <stdio.h>

int main(){
int sum = 0,count = 0,bool_cin = 1;
while(bool_cin){
int num = 0;
printf("请输入一个整数\n");
scanf("%d",&num);
sum += num;
++count;
printf("是否继续?yes->1 no->0\n");
scanf("%d",&bool_cin);
}
double ave = (double)sum/count;
printf("和为%d,平均值为%.2g\n",sum,ave);
return 0;
}

五

include <stdio.h>

int main(){
int num1 = 0,num2 = 0,sum = 0;
printf("请输入两个整数\n");
scanf("%d%d",&num1,&num2);
if(num1 > num2){
num1 += num2;
num2 = num1-num2;
num1 -= num2;
}
int i = 0;
for(i = num1;i <= num2;i++){
sum += i;
}
printf("大于等于%d小于等于%d的整数之和为%d\n",num1,num2,sum);
return 0;
}