Standard Deviation using Function

#include<stdio.h>

#include<conio.h>

#include<math.h>

float mean(int a[],int n);

float std(int a[],int n,float m);

void main()

{

float m,sd;

int n,a[10],i;

clrscr();

printf(“\nenter the number of values\n”);

scanf(“%d”,&n);

printf(“\n enter the elements\n”);

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

scanf(“%d”,&n);

m=mean(a,n);

printf(“mean=%f\n”,m);

sd=std(a,n,m);

printf(“\n sd=%f”,sd);

getch();

}

flaot mean (inta[],intn)

{

float f;

int sum=0;

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

sum=sum+ a[i];

f=(float)sum/n;

return f;

}

float std(int a[],int n,float m)

{

int i;

float std,sum=0.0,d;

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

{

d=a[i]-m;

a=d*d;

sum=sum+d;

}

sd=sqrt(sum\n);

return sd;

}

Output:

enter the number of values

5

enter the elements

2

4

6

8

10

mean=6.000000

sd=2.828427 

Substring Replacement

#include<stdio.h>

#include<conio.h>

#include<string.h>

void main()

{

char str[50],str1[15],str2[15],temp[50];

char *ptr;

int cnt;

clrscr();

printf(“enter a line of text..... \n”);

gets(str);

printf(“enter the string to be replaced... \n”);

gets(str1);

printf(“enter the replacing string...”);

gets(str2);

printf(“\n the replaced line of the text....”);

while(1)

{

ptr=strstr(str,str1);

if(ptr==?\o?)

break;

cnt=ptr-str;

strncpy(temp,str,cnt);

temp[cnt]=?10?;

strcat(temp,str+cnt+strlen(srt1));

strcpy(str1,temp);

puts(str);

}

getch();

}

Output:

enter the line of text... i love india

enter the string to be replaced..india

enter the replacing string...my parents

the replaced line of text

i love my parents