By GokiSoft.com| 20:08 09/12/2021|
Lập Trình C

Ôn tập While, Do .. While, For lập trình C - Lập trình C BT1884

Sử dụng bằng 3 cách cho bài sau : sử dụng while, do .. while, for

Bài 1: Tính S(n) = 1 + 2 + 3 + … + n
Bài 2: Tính S(n) = 1^2 + 2^2 + … + n^2
Bài 3: Tính S(n) = 1 + ½ + 1/3 + … + 1/n
Bài 4: Tính S(n) = ½ + ¼ + … + 1/2n
Bài 5: Tính S(n) = 1 + 1/3 + 1/5 + … + 1/(2n + 1)

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Bình luận

avatar
Nguyễn Tiến Đạt [T2008A]
2020-09-14 10:17:28


Bai tap so 1
#include<stdio.h>
int main()
//Cach for
{
	int n;
	printf("\nNhap n:");
	scanf("%d",&n);
	if (n<=0){
		printf("Ban da lam sai");
	}
	else{
		int tong=0;
		for(int i=0;i<=n;++i)
		tong = tong + i;
		printf("Tong n so la %d",tong);
	}
	getch();
	return 0;
}
//Cach while
{
		int n;
	printf("\nNhap n:");
	scanf("%d",&n);
	if (n<=0){
		printf("Ban da lam sai");
	}
	else{
		int i=1,tong=0;
		while(i<=n){
			tong=tong + i;
			i++;
		}
		printf("\nTong day so = %d ",tong);
	}
	
}
//Cach do...while
{
		int n;
	printf("\nNhap n:");
	scanf("%d",&n);
	if (n<=0){
		printf("Ban da lam sai");
	}
	else{
		int i=1,tong=0;
		do{
			tong=tong+i;
			i++;
		}while(i<=n);
		printf("\nTong day so = %d",tong);
	}
}


avatar
Đặng Trần Nhật Minh [T2008A]
2020-09-14 10:12:52



#include "bits/stdc++.h"

//BAI 1

int main() {

	int s1 = 0, s2 = 0, s3 = 0;
	
	int n;
	printf("Nhap n: "); scanf("%d", &n);
	
	int n1 = n, n2 = n;
	
	//Cach 1:
	for (int i = 0; i <= n; i++) s1 += i;
	
	//Cach 2:
	while (n1 > 0) s2 += n1, n1--;
	
	//Cach 3: 
	do s3 += n2;
	while(--n2);
	
	printf("s = %d, s1 = %d, s2 = %d", s1, s2, s3);

}


avatar
hainguyen [T2008A]
2020-09-14 10:10:06



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

/* run this program using the console pauser or add your own getch, system("pause") or input loop */

int main(int argc, char *argv[]) {
	int S = 0;
	int i = 1;
	int n;
	
	printf("\nNhap n =");
	scanf("%d", &n);
	do {
		S = S + i;
		i = i + 1;
		
	}  while(i<=n);
	printf("\n%d", S);
	

	
	

	return 0;
}


avatar
Nguyên Phấn Đông [community]
2020-09-14 10:08:02



#include<stdio.h>
#include<stdlib.h>
int main(){
	float s=0, c=0, n;
	printf("\nBai 2:");
	printf("\nNhap n: "); scanf("%f",&n);

	printf("\n======== Cach1:");
	while (c <= n ){
	
		s= s +c*c;
		c++;	
	}
	printf("\nS(n)= %f",s);
	printf("\n======== Cach2:");
	s=0; 
	c=0;
	do{
		s+=c*c;
		c++;
		
	}while(c<= (n) );
	printf("\nS(n)= %f",s);
	printf("\n======== Cach3:");
   s=0;
	for (int d=0; d <= n; d++){
		
    s+=d*d;
	}
	printf("\nS(n)= %f",s);


	return 0;
}



#include<stdio.h>
#include<stdlib.h>
int main(){
	float s=0, c=1, n;
	printf("\nBai 3:");
	printf("\nNhap n: "); scanf("%f",&n);

	printf("\n======== Cach1:");
	while (c <= n ){
		s+=1/c;
		c++;
	}
	printf("\nS(n)= %f",s);
	printf("\n======== Cach2:");
	s=0; 
	c=1;
	do{
		s+=1/c;
		c++;
	}while(c<= (n) );
	printf("\nS(n)= %f",s);
	printf("\n======== Cach3:");
   s=0;
	for (float d=1; d <= n; d++){
		
    s+=1/d;
	}
	printf("\nS(n)= %f",s);


	return 0;
}



#include<stdio.h>
#include<stdlib.h>
int main(){
	float s=0, c=1, n, e;
	printf("\nBai 4:");
	printf("\nNhap n: "); scanf("%f",&n);

	printf("\n======== Cach1:");
	while (c <= n ){
		e= 2*c;
		s+=1/e;
		c++;
	}
	printf("\nS(n)= %f",s);
	printf("\n======== Cach2:");
	s=0; 
	c=1;

	do{
		e= 2*c;
		s+= 1/e;
		c++;
	}while(c<= n );
	printf("\nS(n)= %f",s);
	printf("\n======== Cach3:");
   s=0;
   e=0;
	for (int d=1; d <= n; d++){
	e=d*2;
    s+=1/e;
	}
	printf("\nS(n)= %f",s);


	return 0;
}


avatar
Nguyên Phấn Đông [community]
2020-09-14 10:07:26



#include<stdio.h>
#include<stdlib.h>
int main(){
	float s=0, c=0, n;
	printf("\nBai 1:");
	printf("\nNhap n: "); scanf("%f",&n);

	printf("\n======== Cach1:");
	while (c <= n ){
		s+=c;
		c++;
	}
	printf("\nS(n)= %f",s);
	printf("\n======== Cach2:");
	s=0; 
	c=0;
	do{
		s+=c;
		c++;
	}while(c<= (n) );
	printf("\nS(n)= %f",s);
	printf("\n======== Cach3:");
   s=0;
	for (int d=0; d <= n; d++){
		
    s+=d;
	}
	printf("\nS(n)= %f",s);


	return 0;
}


avatar
Nguyễn Hữu Hiếu [T2008A]
2020-09-14 09:46:40



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

/* run this program using the console pauser or add your own getch, system("pause") or input loop */

int main(int argc, char *argv[]) {
	
	float i,n,tong;
	tong = 0;
	i = 1;
	printf("Nhap n = ");
	scanf("%f", &n);
//===========================Cach 1
	for(i=1;i<=n;i++) {
		tong = tong +1/i;
	}
	printf("Sn = %f", tong);
	
//===========================Cach 2
	while (i<=n) {
		tong = tong +1/i;
		i++;
	}
	printf("Sn = %f", tong);
	
//===========================Cach 3
	do {
		tong = tong +1/i;
		i++;
	} while (i<=n);
	printf("Sn = %f", tong);
	
	
	return 0;
}


avatar
Nguyễn Hữu Hiếu [T2008A]
2020-09-14 09:33:23



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

/* run this program using the console pauser or add your own getch, system("pause") or input loop */

int main(int argc, char *argv[]) {
	
	int tong, i, n;
	tong = 0;
	i = 1;
	printf("Nhap n = ");
	scanf("%d", &n);
	
	for(i=1;i<=n;i++) {
		tong = tong + i*i;
	}
	printf("Sn = %d", tong);

//
//	while (i<=n) {
//		tong = tong + i*i;
//		i++;
//	}
//	printf("Sn = %d", tong);

//	do {
//		tong = tong +i*i;
//		i++;
//	} while (i<=n);
//	printf("Sn = %d", tong);

		
	return 0;
}


avatar
Nguyễn Hữu Hiếu [T2008A]
2020-09-14 09:19:31



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

/* run this program using the console pauser or add your own getch, system("pause") or input loop */

int main(int argc, char *argv[]) {
	//Cach 1: for
	int tong, n, i;
	tong = 0;
	i = 1;
	printf("\nNhap n =");
	scanf("%d", &n);
/*	for(i=1;i<=n;i++) {
		tong = tong+i;
	}
	printf("\nSn = %d", tong);
*/
	
	//Cach 2: while
/*	
	while (i<=n) {
		tong = tong + i;
		i++;
	}
	printf("\nSn = %d", tong);
	
*/
	
	//Cach 3: do...while
	
	do {
		tong = tong + i;
		i++;
	} while (i<=n);
	printf("\nSn = %d", tong);

	
	return 0;
}