c Technical basics

Hi Blog readers,

I am sabari, computer science engineer. Here I would like to Share some of my Interview preparation Question you may worked out (compile and run) you will come to know some interesting facts on C Basics,

//No of Args

#include

void main()

{                     

int n,a,b,c;

printf("ENter the 3 nos");

n=scanf("%d%d%d",&a,&b,&c);

printf("No of Args:%d",n);

getch();

}

//Ex2 No of Args

#include

#include

int main()

{

int n,a,b,c;

clrscr();

printf("ENter the 3 nos");

n=scanf("%d%d%d",&a,&b,&c);

printf("No of Args:%d",n);

n=printf(printf("First second"););

printf("No of Args:%d",n);

getch();

return 0;

}

//Digit sum(145),1+4+5=10=1+0=1;

#include

#include

void main()

{

 int n;

 clrscr();

 printf("Enter your no");

 scanf("%d",&n);

 n=n%9;

 if(n!=0)

 {

   printf("the digit sum is %d",n);

  }

  else

  {

   printf("the digit sum is %d",9);

   }

 }

 //Input formatting

 #include

#include

void main()

{

                float x = 12.34567;                              /* The keyword `float' declares the number x

                                                                                                                                   to be a real number. */

                clrscr();

                printf("%f\n", x);

                printf("%8.5f\n", x);

                printf("%8.3f\n", x);

                printf("%-8.3f\n", x);

                printf("%9.2e\n", x);            /* printing real number in exponential form */

                printf("%12.4e\n", x);

                printf("%5e\n", x);

                printf("%8.3f\n", -x);

                getch();

}

#include

#include

int main()

{

int n,f;

clrscr();

printf("Enter the NO:");

scanf("%d",&n);

f=fact(&n);

printf("factorial of given is:%d",f);

getch();

return 0;

}

int fact(int *n)

{

int fact=1,i;

 if(*n==0||*n==1)

   return 1;

  else

{

for(i=1;i<=*n;i++)

 {

   fact=fact*i;

 }

 return fact;

}

 

}

//summation

#include

#include

int main()

{

int n,f;

clrscr();

printf("Enter the NO:");

scanf("%d",&n);

f=sum(&n);

printf("summation of given is:%d",f);

getch();

return 0;

}

int sum(int *n)

{

int sum=0,i;

/*

 if(*n==0||*n==1)

   return 1;

  else

  */

{

for(i=0;i<=*n;i++)

 {

   sum=sum+i;

 }

 return sum;

}

 

}

//swapping ( Four different Techniques)

#include

void main()

{

int a,b;

printf("welcome TO swap\nEnter your two nos:\n");

scanf("%d%d",&a,&b);

swap(a,b);

swap(&a,&b);

printf("The swappwe3d nos:%d%d",a,b);

swapt(&a,&b);

printf("The swappwe3d nos:%d%d",a,b);

swapBit(&a,&b);

printf("The swappwe3d nos:%d%d",a,b);

printf("The swappwe3d nos:%d%d",a,b);

swap1(a,b);

getch();

}

//call by value

int swap(int x,int y)

{

 int t;

 t=x;

 x=y;

 y=t;

 printf("The swappwe3d nos:%d%d",x,y);

}

//call by value

int swap1(int x,int y)

{

 x=(x+y)-(y=x);

 printf("The swappwed nos:%d%d",x,y);

}

//call by Ref

int swap(int *x,int *y)

{

 int t;

 t=*x;

 *x=*y;

 *y=t;

}

int swapt(int *x,int *y)

{

 //int t;

 *x=*x+*y;

 *y=*x-*y;

 *x=*x-*y;

}

int swapBit(int *x,int *y)

{

 //int t;

 *x=*x+*y;

 *y=*x-*y;

 *x=*x-*y;

}

//text compresion

#include

#include

void main()

{

FILE *fp,*fd;

char a,b;

int i=1,j;

clrscr();

gotoxy(10,15);

fp=fopen("intxt.txt","r");

fd=fopen("outtxt.txt","w");

fscanf(fp,"%c",&b);

while(!feof(fp))

{

fscanf(fp,"%c",&a);

if(b==a)

{

i++;

}

else

{

if(i>=2)

{

printf("@");

fprintf(fd,"@");

printf("%c%d",b,i);

i=1;

}

else

{

for(j=0;j

{

printf("%c",b);

fprintf(fd,"%c",b);

} i=1;

}}

b=a;

}

if(i>2)

{

printf("@");

fprintf(fd,"%c",a);

i=0;

}

getch();

}