c语言程序设计试题及答案c语言编程题 ：设计程序求自然数1~100（包括1和100）中含有1的所有数的和！

C语言编程试题。题目 输入n的值,计算1到n的和,主函数实现输入输出，自定义函数sum(int n)实现求和

#include <stdio.h>

int sum(int n)

{

int total = 0;

for(int count=1;count<=n;count++)

{

total = total + count;

}

returntotal;

}

int main()

{

int n;

printf("请输入n=");

scanf("%d", &n);

printf("1+2+...+n=%d ", sum(n));

return 0;

}

求C语言编程高手，帮忙做题，谢谢！

#define DATA_NUM3 2 #define DATA_NUM4 3

#include <stdio.h> #include <stdlib.h>

int IsPrimeNumber(int n) { if(1 >= n) return -1; int i; for(i=2; i<n; i++) { if(0 == n%i) return -1; } return 1; }

long Factorial(int n) { if(1 >= n) return 1L; return Factorial(n-1)*n; }

void InputNumber(int* data, int n) { int i; for(i=0; i<n; i++) { scanf("%d", &data[i]); } }

void OutputNumber(int* data, int n) { int i; for(i=0; i<n; i++) { printf("%d ", data[i]); } printf(" "); }

void Sort(int* data, int n) { int i, j; for(i=0; i<n-1; i++) { for(j=i+1; j<n; j++) { if(data[i] > data[j]) { int temp = data[i]; data[i] = data[j]; data[j] = temp; } } } }

int Find(int* data, int Num, int n) { int i; for(i=0; i<n; i++) { if(Num == data[i]) return i; } return -1; }

int MaxData(int* data, int n, int* order) { int i; int max = *data; for(i=1; i<n; i++) { if(max < data[i]) { max = data[i]; *order = i; } } return max; }

void main() { printf("No.1 "); int NumOfPrim = 0; for(int i=3; i<100; i++) { if(1 == IsPrimeNumber(i)) { NumOfPrim ++; printf("%d ", i); } } printf(" %d prime number(s) ", NumOfPrim); printf(" No.2 "); printf("5!=%ld ", Factorial(5)); printf(" No.3 "); printf("Please input %d numbers ", DATA_NUM3); int data3[DATA_NUM3]; InputNumber(data3, DATA_NUM3); Sort(data3, DATA_NUM3); OutputNumber(data3, DATA_NUM3); int datawillfind; printf("Please input the number you want to find "); scanf("%d", &datawillfind); if(-1 != Find(data3, datawillfind, DATA_NUM3)) printf("yes "); else printf("no found "); printf(" No.4 "); int data4[DATA_NUM4]; printf("Please input %d numbers ", DATA_NUM4); for(i=0; i<DATA_NUM4; i++) { scanf("%d", &data4[i]); } int order = 0; int max = MaxData(data4, DATA_NUM4, &order); printf("The max data is: data[%d]=%d ", order, max); printf(" No.5 "); printf("Please input 3 numbers "); int data5[3]; for(i=0; i<3; i++) { scanf("%d", &data5[i]); } Sort(data5, 3); OutputNumber(data5, 3); }

对于第3题和第4题，分别把

#define DATA_NUM3 2 #define DATA_NUM4 3

改为

#define DATA_NUM3 10 #define DATA_NUM4 20

即可，谢谢采纳！

c语言编程题 ：设计程序求自然数1~100（包括1和100）中含有1的所有数的和！

void fun() { int sum=1+10+100; for(int i=11;i<100;i++) { if(i%10==1) sum+=i; } }