C Introduction Programs Part 1

write a c program to read three sides of a triangle,calculate and print the perimeter and area usng formatted IO statements.
#include<stdio.h>
main()
{
                int a,b,c;
                int s,area,perimeter;
                printf(“enter values of a,b,c”);
                scanf(“%d%d%d”,&a,&b,&c);
                s=(a+b+c)/2;
                perimeter=a+b+c;
                area=sqrt(s*(s-a)*(s-b)*(s-c));
                printf(“AREA=%d\nPERIMETER=%d”,area,perimeter);
               
}

Write a c program to count the number of words in a sentence entered from the keyboard at run time.
#include<stdio.h>
main()
{              int i=0,count=0;
                char str[30];
printf(“enter a sentence:”);
gets(str);
for(i=0;str[i]!=’\0’;i++)
{             
if(str[i]==’ ‘||str[i]==’.’ ‘||str[i]==’?’ ‘||str[i]==’!’)
        count++;
                }
                printf(“no of words in given sentence=%d”,count);

}
Earth takes a period of revolution of 3155150 seconds.Write a c program to convert this into number of days ,hours and minutes.
#include<stdio.h>
long seconds;
int days,hours,minutes;
void convert();
void getsec();

void output();
main()
{

getsec();
convert();
output();
               

}

long notenough4days;
long remainseconds;
long notenough4hours;
void convert()
{
                days=seconds/86400;
                notenough4days = seconds%86400;
                remainseconds = notenough4days;
                hours = remainseconds/3600;
                notenough4hours = remainseconds%3600;
                remainseconds = notenough4hours;
                minutes = remainseconds/60;
}


void getsec()
{
                printf("Input seconds: ");
                scanf("%ld",&seconds);
}
void output()
{
                printf("days = %i\n", days);
                printf("hours = %i\n", hours);
                printf("minutes = %i\n", minutes);
}


/*
output
student@ubuntu:~$ ./a.out
Input seconds: 3155150
days = 36
hours = 12
minutes = 25
*/
Write a c program to read a 6 digit number and print it in reverse order
#include<stdio.h>
main()
{
                long no,s=0;
                int i,r;
                printf("enter a 6 digit no");
                scanf("%ld",&no);
                while(no>0)
                {
                                r=no%10;
                                s=s*10+r;
                                no=no/10;
                }
                printf("reverse=%ld",s);
}
/*output
enter a 6 digit no123456
reverse=654321
*/
Factorial of a number

#include<stdio.h>
int main()
{
  int i=1,f=1,num;

  printf("Enter a number: ");
  scanf("%d",&num);

  while(i<=num)
{
      f=f*i;
      i++;
  }

  printf("Factorial of %d is: %d",num,f);
  return 0;
}
Write a c program to read marks scored by 500 students and count how many have passed(40% required to pass)

Using arrays:
#include<stdio.h>
main()
{
                int a[700];
                int i,n,count=0;
                printf("enter the limit of students:");
                scanf("%d",&n);
                for(i=0;i<n;i++)
                {
                                printf("enter marks of student %d\n",i+1);
                                scanf("%d",&a[i]);
                                if(a[i]>40)
                                count++;
                }
                printf("\ncount of students passed: %d",count);
               
               
}
/*output
enter the limit of students:5
enter marks of student 1
56
enter marks of student 2
56
enter marks of student 3
45
enter marks of student 4
3
enter marks of student 5
5

count of students passed: 3
*/
Without using arrays:
#include<stdio.h>
main()
{
                int marks;
                int i,n,count=0;
                printf("enter the limit of students:");
                scanf("%d",&n);
                for(i=0;i<n;i++)
                {
                                printf("enter marks of student %d\n",i+1);
                                scanf("%d",&marks);
                                if(marks>40)
                                count++;
                }
                printf("\ncount of students passed: %d",count);
               
               
}
Write a program that reads length, width of a rectangle from user and compute its area perimeter and length of diagonal.
#include<stdio.h>
#include<math.h>
main()
{
                float l,b,area,per,len;
                printf("enter length and breadth of a rectangle:");
                scanf("%f%f",&l,&b);
                area=l*b;
                per=2*(l+b);
                len=sqrt(l*l+b*b);               
                printf("\n area=%f\n perimeter=%f\ndiagonal length=%f",area,per,len);
               
}
/*output
enter length and breadth of a rectangle:18 19

 area=342.000000
 perimeter=74.000000
diagonal length=26.172504
*/

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