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  Simple calculator Quadratic equation Electricity Bill Binary Search on Integers / Names Matrix multiplication Taylor series Bubble sort.  string operations such as compare, concatenate and string length.  Above and below the average  Pointers  Binary to Decimal Conversion.

Binary to Decimal conversion  #include<stdio.h> #include<stdlib.h> int dec=0; int bintodec(int num,int x,int base); void main() { int num,n,r,x=0,base=1; printf("enter a binary number\n"); scanf("%d",&n); num=n; while(n>0) { r=n%10; if(r>1) { printf("enter a proper binary number\n"); exit(0); } x++; n=n/10; } bintodec(num,x,base); printf("decimal value of %d is %d\n",num,dec); } int bintodec (int num,int x,int base) { if(x==0) return 0; else dec=dec+(num%10)*base; bintodec(num/10,x-1,base*2); } Algorithm Binary to Decimal conversion Algorithm : Binary to Decimal conversion Start Declare the required variables Read binary number as n If n has digits...

pointers #include <stdio.h> #include <math.h> void main() { float a[10], *ptr, mean, sum=0, std,sumstd=0; int n,i; printf("Enter the number of elements : "); scanf("%d",&n); printf("Enter the array elements :\n"); for( i=0; i<n; i++) scanf("%f",&a[i]); //assigning address of a to pointer ptr ptr = a; //compute the sum for(i=0;i<n;i++) { sum += *ptr; ptr++; } //compute the mean mean = sum/n; //compute standard deviation ptr = a; for(i=0; i<n; i++) { sumstd = sumstd + pow((*ptr-mean),2); ptr++; } std = sqrt(sumstd/n); //print sum, mean, & standard deviation printf("Sum = %f\n",sum); printf("Mean = %f\n",mean); printf("Standard Deviation : %f\n",std); } POINTERS Algorithm   Start Read number of element...

Structures abov below avg #include<stdio.h> struct student { char name [100]; char usn [20]; float marks; }; void main() { int i,j,k,m,n,aboveavg[100],belowavg[100]; float total=0.0,avg=0.0; struct student s[100]; printf("enter number of students\n"); scanf("%d",&n); for(i=0;i<n;i++) { printf("enter the details of students%d\n",i+1); printf("enter name\n"); scanf("%s",s[i].name); printf("enter usn\n"); scanf("%s",s[i].usn); printf("enter marks\n"); scanf("%f",&s[i].marks); total+=s[i].marks; } printf("enter the details of students\n"); printf("name\t\t usn\t\t marks\n"); for(i=0;i<n;i++) printf("%s\t\t %s\t\t %f\n",s[i].name,s[i].usn,s[i].marks); avg=total/n; printf("avg=%f\n",avg); j=0; k=0; for(i=0;i<n;i++) { if(s[i].marks>avg) abov...

STRINGconcatenation #include<stdio.h> #include<stdlib.h> int length (char str[]); int compare (char str1[],char str2[]); void concatenate (char str1[],char str2[]); void main() { char str1[30],str2[30]; int choice,a,i,j; printf("enter 1-string comparision\n"); printf("enter 2-string length\n"); printf("enter 3-string concatenation\n"); printf("enter 4-exit\n"); scanf("%d",&choice); switch(choice) { case 1:printf("enter string 1\n"); scanf("%s",str1); printf("enter string 2\n"); scanf("%s",str2); a=compare(str1,str2); if(a==0) { printf("%s and%s are identical\n",str1,str2); } else { printf("%s and%s are not identical\n",str1,str2); } break; ...

Bubble sort #include<stdio.h> int main() { int i,j,n,a[100],temp; printf("enter the number of elements"); scanf("%d",&n); printf("enter the elements\n"); for(i=0;i<n;i++) scanf("%d",&a[i]); for(i=0;i<n-1;i++) { for(j=0;j<n-i-1;j++) { if(a[j]>a[j+1]) { temp=a[j]; a[j]=a[j+1]; a[j+1]=temp; } } } printf("sorted arry\n"); for(i=0;i<n;i++) printf("%d\t",a[i]); return 0; } Algorithm: BubbleSort Start read n for i= 0 to n-1 read a[i] for i=0 to n-1 for j=0 to n-i-1 if (a[j] > a[j+1]) temp = a[j] a[j] = a[j+1] a[j+1] = temp for i=0 to n-1 print a[i] Stop

Taylor series  #include<stdio.h> #include<stdlib.h> #include<math.h> int main() {  int ch,i;  float num,den,x,degree,sum=0,term;  printf("enter 1 for sin(x)\n enter 2 for cos(x)\n");  scanf("%d",&ch);  printf("enter the degree\n");  scanf("%f",&degree);  x=(degree*3.14)/180.0;  switch(ch) {   case 1:num=x;   den=1;   i=2; break;   case 2:num=1;   den=1;   i=1;   break;   default:printf("enter the proper choice\n");   exit(0); }   do {   term=num/den;   num=-num*x*x;   den=den*i*(i+1);   sum=sum+term;   i=i+2; } while(fabs(term)>0.000001);   if(ch==1) {   printf("sin(%f)without using built in function=%f\n",degree,sum);   printf("sin(%f)with using built in function=%f\n",degree,sin(x)); } else {  printf("cos(%f) without using buil...

Matrix Multiplication #include<stdio.h> #include<stdlib.h> void main() { int a[10] [10],b[10] [10],c[10] [10],i,j,k,m,n,p,q; printf("enter the order of the matrix A\n"); scanf("%d%d",&m,&n); printf("enter the order of the matrix B\n"); scanf("%d%d",&p,&q); if(n!=p) {     printf("matrix multiplication is not possible\n");     exit(0); } printf("enter the elements of A\n"); for(i=0;i<m;i++) {     for(j=0;j<n;j++)     {         scanf("%d",&a[i][j]);     } } printf("enter the elements of B\n"); for(i=0;i<p;i++) {     for(j=0;j<q;j++)     {      scanf("%d",&b[i][j]);        } } for(i=0;i<m;i++) {     for(j=0;j<q;j++)     {         c[i][j]=0;         for(k=0;k<n;k++)         ...

BinarySearch #include<stdio.h> #include<stdlib.h> #include<string.h> void main() { int a[20],low,mid,high,i,n,k,ch; char b[20][20],key[20]; printf("1. binary search for integer\n2. Binary search for string/name\n"); printf("Enter your choice:\t"); scanf("%d",&ch); switch(ch) { case 1: /* For integers */              printf("Enter the number of elements  in ascending order  \n");              scanf("%d",&n);                          printf("Enter the elements\n");              for(i = 0 ; i < n ; i++)                  ...

#include<stdio.h> #include<stdlib.h> #include<math.h> void main() {     float a,b,c,x1,x2,sp,ip,disc;     printf("enter the co-efficients\n");     scanf("%f%f%f",&a,&b,&c);     if(a==0)     {         printf("a cannot be zero");         exit(0);     }     disc=b*b-4*a*c;     if(disc==0)     x1=x2=-b/(2*a);     printf("the roots are equal\n");     printf("x1=%f\n x2=%f\n",x1,x2); }     else if(disc>0) {     x1=(-b+sqrt(disc))/(2*a);     x2=(-b-sqrt(disc))/(2*a);     printf("the roots are real and distinct\n");     printf("x1=%f\n x2=%f\n";x1,x2); } else  {     sp=-b/(2*a);     ip=sqrt(fabs(disc))/(2*a);     printf("the roots are Complex\n");     printf("first root=%f+i%f\n",sp,ip);     printf("second root=...

Electricity sort #include<stdio.h> void main() { int units; float charges; char name[20]; printf("Enter the name of the customer\n"); scanf("%s",name); printf("Enter the units consumed\n"); scanf("%d",&units); charges=100; if(units>0&&units<=200) charges=charges+0.8*units; else if (units>200&&units<=300) charges=charges+0.8*200+(300-units)*0.9; else charges=charges+0.8*200+100*0.9+(units-300)*1; if(charges>400) charges=charges+0.15*charges; printf("name=%s\n",name); printf("units consumed=%d\n",units); printf("charges=%f\n",charges); } Algorithm: Electricity bill   Start Read name, units consumed as units charge = 100 if units is <= 100 then comp...

simple calculator #include<stdio.h> #include<stdlib.h> void main() { float a,b,c; char op; printf("enter the two operands\n"); scanf("%f%f",&a,&b); printf("enter an operator\n"); scanf(" %c",&op); switch (op) { case '+': c=a+b; printf("%f+%f=%f\n",a,b,c); break; case '-': c=a-b; printf("%f-%f=%f\n",a,b,c); break; case '*': c=a*b; printf("%f*%f=%f\n",a,b,c); break; case '/': if(b!=0) { c=a/b; printf("%f/%f=%f\n",a,b,c); exit(0); } else printf("division by 0 error"); break; default: printf("enter valid operation"); } } simple calculator Start  Read 2 numbers as a and b Read operator (+ or – or * or /) a...