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Delete file #include &ltstdio.h > main() {   int status;   char file_name[25];   printf("Enter the name of file you wish to delete\n");   gets(file_name);   status = remove(file_name);   if( status == 0 )   printf("%s file deleted successfully.\n",file_name);   else   {   printf("Unable to delete the file\n");   perror("Error");   }   return 0; }

clc; close all; clear all; q=imread('BIRDS.jpg'); p=rgb2gray(q); k=imnoise(p,'salt & pepper', .5); c= medfilt2(k,[3 3]); d= medfilt2(k,[5 5]); e= medfilt2(k,[7 7]); figure; subplot(2,3,1),imshow(q),title('original image'); subplot(2,3,2),imshow(p),title('Grayscale image'); subplot(2,3,3),imshow(k),title('noisy image'); subplot(2,3,4),imshow(c),title('filtered 3x3 image'); subplot(2,3,5),imshow(d),title('filtered 5x5 image'); subplot(2,3,6),imshow(e),title('filtered 7x7 image'); OUTPUT:

clc; close all; clear all; a=imread('BIRDS.jpg'); b=rgb2gray(a); figure; subplot(2,2,1),imshow(a),title('original image'); subplot(2,2,2),imshow(b),title('Grayscale image'); subplot(2,2,3),imshow(b),title('Histogram image'); OUTPUT:

clc; close all; clear all; a=imread('BIRDS.jpg'); b=rgb2gray(a); r=a(:,:,1); g=a(:,:,2); b=a(:,:,3); new=cat(3,r,g,b); figure; subplot(2,3,1),imshow(a),title('original image'); subplot(2,3,2),imshow(b),title('Grayscale image'); subplot(2,3,3),imshow(r),title('red scale image'); subplot(2,3,4),imshow(g),title('green scale image'); subplot(2,3,5),imshow(b),title('blue scale image'); subplot(2,3,6),imshow(new),title('reconstructed image'); OUTPUT:

Print string #include < stdio.h >   int main() {   char array[100];   printf("Enter a string\n");   scanf("%s", array);   printf("You entered the string %s\n",array);   return 0; } String length #include < stdio.h > #include < string.h > int main() {   char a[100];   int length;   printf("Enter a string to calculate it's length\n");   gets(a);   length = strlen(a);   printf("Length of entered string is = %d\n",length);   return 0; } Compare strings #include < stdio.h > #include < string.h > int main() {   char a[100], b[100];   printf("Enter the first string\n");   gets(a);   printf("Enter the second string\n");   gets(b);   if( strcmp(a,b) == 0 )   printf("Entered strings are equal.\n");   else   printf("Entered strings are not equal.\n");   return 0; } Concatenate strings #include < st