C Programming Codes

// performing subraction on pointers. #include<stdio.h> void main() { int a[5]={6,4,2,5,8}; int *p=&a[0]; int *q=&a[4]; printf("p-q=%d\n",p-q); //p-q=-4 *q=15; // now a[4]=15 printf("q-p=%d\n",q-p); //q-p=4 *p=32; //now ,a[0]=32 q=q-3; //now q is pointing to a[1] printf("value:%d\n",*q); //value:4 p=p+3; //now p is pointing to a[3] printf("value:%d\n",*p); //value:5 printf("p-q=%d\n",p-q); //p-q=2 }

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//performing addition on pointer. #include<stdio.h> void main() { int a[5]={5,3,9,7,2}; int *p=&a[0]; printf("Value : %d\n",*p); //Value :5 printf("Address of element:%u\n",p); //Adress of element:6422280 p=p+2; //The pointer will point to a[2] *p=4; //Now the value of a[2] is modified to 4 printf("Value :%d\n",*p); //Value:9 printf("Address of element:%u\n",p); //Adress of element:6422288 }

// // pointer is a variable which stores the adress of other variable. // // int *p :- p is a pointer variable which stores the adress of any other int type variable // // (&)adress of (*) indirection/dereferencing operator // #include<stdio.h> // void main() // {int a=5,b=6; // int *p,*q; //declaration of pointers p and q // p=&a; // pointer variable p,has the address of variable a // q=&b; // pointer variable q, has the adress of variable b // printf("Value of a:%d\n",*p); //*p will give the value of a i.e *(&a) value at adress of a // printf("Value of b:%d",*q); //*q will give the alue of b i.e *(&b) value at adress of b // } //performing addition on pointer. #include<stdio.h> void main() { int a[5]={5,3,9,7,2}; int *p=&a[0]; printf("Value : %d\n",*p); //Value :5 printf("Address of element:%u\n",p); //Adress of element:6422280 p=p+2; //The pointer will point to a[2] *p=4; //Now the value of a[2] is modified to 4 printf("Value :%d\n",*p); //Value:9 printf("Address of element:%u\n",p); //Adress of element:6422288 }

// pointer is a variable which stores the adress of other variable. // int *p :- p is a pointer variable which stores the adress of any other int type variable // (&)adress of (*) indirection/dereferencing operator #include<stdio.h> void main() {int a=5,b=6; int *p,*q; //declaration of pointers p and q p=&a; // pointer variable p,has the address of variable a q=&b; // pointer variable q, has the adress of variable b printf("Value of a:%d\n",*p); //*p will give the value of a i.e *(&a) value at adress of a printf("Value of b:%d",*q); //*q will give the alue of b i.e *(&b) value at adress of b }

// Program to reverse a sring using a loop. #include<stdio.h> #include<string.h> int main() { char str[50]; printf("Enter the string:"); gets(str); int i,l=strlen(str); for(i=0;i<l/2;i++) { char ch=str[i]; str[i]=str[l-1-i]; str[l-1-i]=ch; } printf("Reversed string:\n%s",str); return 0; }

// Program to reverse a sring using strrev function. #include<stdio.h> #include<string.h> int main() { char str[20]="coding"; strrev(str); printf("Reversed string:\n%s",str); return 0; }

// Program to concatenate two strings using a loop. #include<stdio.h> #include<string.h> int main() { int l1,l2,i; char s1[50]="C_"; char s2[50]="Programming"; l1=strlen(s1); l2=strlen(s2); for(i=0;i<=l2;i++) { s1[l1+i]=s2[i]; } printf("Concatenated string:\n%s",s1); return 0; }

// Program to concatenate two strings using strcat function. #include<stdio.h> #include<string.h> int main() { char s1[50]="C_"; char s2[50]="Programming"; strcat(s1,s2); printf("Concateated string:\n%s",s1); return 0; }

// Program to find length of a string using a loop. #include<stdio.h> int main() { int len=0,i; char string[100]; printf("Enter string:"); gets(string); for(i=0;string[i]!='\0';i++) { len++; } printf("Length of the string is: %d",len); return 0; }

// Program to find length of a string using strlen function #include<stdio.h> #include<string.h> int main() { int len=0; char string[100]; printf("Enter string:"); gets(string); len=strlen(string); printf("Length of the string is: %d",len); return 0; }

//Program to read a string and print it. #include<stdio.h> int main() {char name[20]; printf("Enter name:"); gets(name); puts(name); return 0; }

//Program for matrix multiplication. #include<stdio.h> int main() {int r1,c1,r2,c2; printf("Enter number of rows in first matrix:"); scanf("%d",&r1); printf("Enter number of coulumns in first matrix:"); scanf("%d",&c1); printf("Enter number of rows in second matrix:"); scanf("%d",&r2); printf("Enter number of coulumns in second matrix:"); scanf("%d",&c2); if(c1==r2) //two matrices can be multiplied only if coloumns of first matrix is equal to rows of second matrix { printf("The matrices can be multiplied.\n"); int a[r1][c1],b[r2][c2],c[r1][c2],i,j,k,sum=0; printf("Enter the elements of first matrix:\n"); for(i=0;i<r1;i++) { for(j=0;j<c1;j++) { printf("Enter the Element at a[%d][%d]:",i,j); scanf("%d",&a[i][j]); } } printf("Enter the Elements of second matrix:\n"); for(i=0;i<r2;i++) { for(j=0;j<c2;j++) { printf("Enter the Element at b[%d][%d]:",i,j); scanf("%d",&b[i][j]); } } for(i=0;i<r1;i++) { for(j=0;j<c2;j++) { sum=0; for(k=0;k<c1;k++) { sum=sum+(a[i][k]*b[k][j]); } c[i][j]=sum; } } printf("Matrix 1:\n"); for(i=0;i<r1;i++) { for(j=0;j<c1;j++) { printf("%d\t",a[i][j]); } printf("\n"); } printf("Matrix 2:\n"); for(i=0;i<r2;i++) { for(j=0;j<c2;j++) { printf("%d\t",b[i][j]); } printf("\n"); } printf("Matrix 1 * Matrix 2:\n"); for(i=0;i<r1;i++) { for(j=0;j<c2;j++) { printf("%d\t",c[i][j]); } printf("\n"); } } else{ printf("Matrix cannot be multipled Enter the row and column number correctly."); } return 0; }

//Program to do sum of 2 matrices and store the sum in third matrix, read the elements of matrix. #include<stdio.h> int main() {int a[2][3],b[2][3],c[2][3],i,j; printf("Enter elemnts of first matrix:\n"); for(i=0;i<2;i++) { for(j=0;j<3;j++) { printf("Enter the element at a[%d][%d]:",i,j); scanf("%d",&a[i][j]); } } printf("Enter elemnts of second matrix:\n"); for(i=0;i<2;i++) { for(j=0;j<3;j++) { printf("Enter the element at b[%d][%d]:",i,j); scanf("%d",&b[i][j]); } } for(i=0;i<2;i++) { for(j=0;j<3;j++) { c[i][j]=a[i][j]+b[i][j]; } } printf("The sum of two matices=\n"); for(i=0;i<2;i++) { for(j=0;j<3;j++) { printf("%d\t",c[i][j]); } printf("\n"); } return 0; }

//Program to perform sum of individual row and column of 3X3 matrix, read the elements of matrix. #include<stdio.h> int main() {int m[3][3],i,j,sr,sc; for(i=0;i<3;i++) { for(j=0;j<3;j++) { printf("Enter the element at m[%d][%d]:",i,j); scanf("%d",&m[i][j]); } } printf("The matrix is:\n"); for(i=0;i<3;i++) { for(j=0;j<3;j++) { printf("%d\t",m[i][j]); } printf("\n"); } for(i=0;i<3;i++) { sr=0,sc=0; for(j=0;j<3;j++) { sr=sr+m[i][j]; sc=sc+m[j][i]; } printf("Th sum of row %d:%d\n",i,sr); printf("The sum of column %d:%d\n",i,sc); } }

//Program to read 2X3 matrix and print transpose of it (3X2). #include <stdio.h> int main() { int m[2][3],i,j; for(i=0;i<2;i++) { for(j=0;j<3;j++) { printf("Enter the element at m[%d][%d]:",i,j); scanf("%d",&m[i][j]); } } printf("The matrix is:\n"); for(i=0;i<2;i++) { for(j=0;j<3;j++) { printf("%d\t",m[i][j]); } printf("\n"); } printf("The transposed matrix is:\n"); for(i=0;i<3;i++) { for(j=0;j<2;j++) { printf("%d\t",m[j][i]); } printf("\n"); } return 0; }

//Program to print 2X3 matrix and find sum of all elemets in it. #include <stdio.h> int main() { int m[2][3],i,j,sum=0; for(i=0;i<2;i++) { for(j=0;j<3;j++) { printf("Enter the element at m[%d][%d]:",i,j); scanf("%d",&m[i][j]); sum=sum+m[i][j]; } } printf("The matrix is:\n"); for(i=0;i<2;i++) { for(j=0;j<3;j++) { printf("%d\t",m[i][j]); } printf("\n"); } printf("Sum of all the elements of matrix:%d",sum); return 0; }

/*Program to read 2 arrays of size 5 and store integers in them ,then calculate the sum of corresponding elements of those two array's and store the result in third array .*/ #include <stdio.h> int main() { int a[5],b[5],c[5]; printf("Enter the elements of first array:\n"); for(int i=0;i<5;i++) { printf("Enter the Element at %d index:",i); scanf("%d",&a[i]); } printf("Enter the elements of second array:\n"); for(int i;i<5;i++) { printf("Enter the Element at %d index:",i); scanf("%d",&b[i]); } printf("Elements of Third Array after calculating sum of 2 arrays:\n"); for(int i=0;i<5;i++) { c[i]=a[i]+b[i]; printf("The Element at index %d is :%d\n",i,c[i]); } return 0; }

//Program to read array of 10 integers and count number of even and odd elements. #include <stdio.h> int main() { int n[10],even=0,odd=0; for(int i=0;i<10;i++) { printf("Enter element at index %d:",i); scanf("%d",&n[i]); if(n[i]%2==0){ even++; } else{ odd++; } } printf("Total number of even numbers are:%d\n",even); printf("Total number of odd numbers are:%d\n",odd); return 0; }

//Program to read marks of 5 subjects and calculate total marks and average. #include <stdio.h> int main() { float marks[5],sum=0.0; float avg; for(int i=0;i<5;i++) { printf("Enter marks in Subject %d:",i+1); scanf("%f",&marks[i]); sum=sum+marks[i]; } avg=sum/5; printf("Total marks obtained:%.2f\n",sum); printf("Average:%f",avg); return 0; }