Bài tập 4.1

I.Lý Thuyết
1 Vòng lặp for :
-Là lệnh trong chương trình dùng để lặp đi lặp lại các đoạn mã cho đến khi thỏa mãn điều kiện.
Cú pháp :
for(initialize couter; conditional test; re valuation)
{
     satement;
}
trong thực hành initialize couter; conditional test; re valuation có thể có hoặc không nhưng bắt buộc trong () phải có 2 dấu ;; (;;) để chương trình có thể chạy.
-Ngoài vòng lặp for đơn chúng ta còn có vòng lặp for lồng nhau....
II.Bài Tập
Bài 1Declare a variable which has the age of the person. Print the user’s name as many times as his age :
Bài Làm

#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 a=1;
    for(a;a<=19;a=a+1){
    printf("\t%d Nguyen Huy",a);
   
    }
    return 0;
}
Bài 2 : The program displays even numbers from 1 to 30.

#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 a=1;
    for(a;a<=30;a=a+1){
    printf("\t%d ",a);
   
    }
    return 0;
}
Bài3: The program displays numbers from 10 to 0 in the reverse order

#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 a=10;
    for(a;a>=1;a=a-1){
    printf("\t%d ",a);
   
    }
    return 0;
}
Bài 4 : . The program will accept integers and display them until zero (0) is entered

#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 a;

    for(;a!=0;){
        printf("Nhap vao 1 so=");
         scanf("%d",&a);       
    }
    printf("Ket Thuc.");

    return 0;
}
Bài 5 : Find the factorial of a number.

 Hint:

1. Get the number.
2. To begin, set the factorial of the number to be one.
3. While the number is greater than one
4. Set the factorial to be the factorial multiplied by the number.
5. Decrement the number.
6. Print out the factorial
   
   
   
   #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 a,b,A;
   printf("Nhap a=");
   scanf("%d",&a);
   b=1;
   A=1;
   for(b;b<=a;b=b+1){
   A=A*b;
   }
   printf("Vay %d!=%d",a,A,a*b);
   return 0;
   }

Bài 6 :6.  Write a program to print the series 100, 95 , 90, 85,………., 5.

 #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 a=100;
for(a;a>=5;a=a-5){
printf("%d ",a);
}
return 0;
}
Bài 7 :

Accept two numbers num1 and num2. Find the sum of all odd numbers between the two

 numbers entered .

#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 num1,num2,b;
printf("Nhap Num1 =");
scanf("%d",&num1);
printf("Nhap Num2 =");
scanf("%d",&num2);
if(num1%2==0)
num1=num1+1;
for(;num1<=num2;num1=num1+2){

b=num1+num2;}
printf("Tong cac so le :%d",b);
    return 0;
}
Bài 8 :

Write a program to generate the Fibonacci series. (1,1,2,3,5,8,13,………)

 #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 a,b,c,A;
a=0;
b=1;
c=1;
printf("Nhap A :");
scanf("%d",&A);
for(a=0;a<=A;){
c=a+b;
b=a;
a=c;
printf("\t%d",c);
}
return 0;
}