C program to find summation of a sine series, cosine series , exponential series

/*to find summation of a sine series with specific accuracy*/

#include<stdio.h>

#include<math.h>

void

main()

{

                float x,sum,t;

                int i;

                printf("enter the value of x in degrees:");

                scanf("%f",&x);

                x=x*(3.1415/180);

                sum=x;

                t=x;

                i=1;

label:i=i+2;

                  t=((-t)*x*x)/(i*(i-1));

                  if(fabs(t)>0.00001)

                  {

                                  sum=sum+t;

                                  goto label;

                  }

                  else

                                  printf("\n sin(x)=%f\n",sum);

}

Result1:

enter the value of x in degrees:90

 sin(x)=1.000004

Press any key to continue

Result2:

enter the value of x in degrees:47

 sin(x)=0.731337

Press any key to continue

/*to find summation of a cosine series with specific accuracy*/

#include<stdio.h>

#include<math.h>

void

main()

{

                float x,sum,t;

                int i;

                printf("enter the value of x in degrees:");

                scanf("%f",&x);

                x=x*(3.1415/180);

                sum=1;

                t=1;

                i=0;

label:i=i+2;

                  t=((-t)*x*x)/(i*(i-1));

                  if(fabs(t)>0.00001)

                  {

                                  sum=sum+t;

                                  goto label;

                  }

                  else

                                  printf("\n cos(x)=%f\n",sum);

}

RESULT1:

enter the value of x in degrees:0

 cos(x)=1.000000

Press any key to continue

RESULT2:

enter the value of x in degrees:47

 cos(x)=0.682011

Press any key to continue

/*to find summation of a exponential series with specific accuracy*/

#include<stdio.h>

#include<math.h>

void

main()

{

                float x,sum,t;

                int i;

                printf("enter the value of x:");

                scanf("%f",&x);

                sum=1;

                t=1;

                i=0;

label:i=i++;

                  t=((t)*x)/(i);

                  if(fabs(t)>0.00001)

                  {

                                  sum=sum+t;

                                  goto label;

                  }

                  else

                                  printf("\n exp(x)=%f\n",sum);

}

Result1:

enter the value of x:0

 exp(x)=1.000000

Press any key to continue

Result2:

enter the value of x:5

 exp(x)=148.413162

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