https://www.learntosolveit.com/ is a companion website to learn C programming using K&R book using modern tools. This post discusses exercises and topics from the book.
/** * Exercise 2.4 * * Let us write a version of squeeze(s1,s2) that deletes each * character in the string 1 that matches any character in the string s2. * Utilize user defined function mgetline to input the strings. * Don't use any standard library string manipulation function. * **/ #include <stdio.h> #define MAXLINE 1000 int mgetline(char s[], int lim); void squeeze(char s1[], const char s2[]); int main(void) { char s1[MAXLINE], s2[MAXLINE]; mgetline(s1, MAXLINE); mgetline(s2, MAXLINE); squeeze(s1, s2); printf("\n%s\n", s1); return 0; } int mgetline(char s[], int lim) { int i, c; for (i = 0; i < lim - 1 && (c = getchar()) != EOF && c != '\n'; ++i) s[i] = c; if (c == '\n') s[i++] = c; s[i] = '\0'; return i; } void squeeze(char s1[], const char s2[]) { int i, j, k; k = 0; for (i = 0; s1[i] != '\0'; ++i) { for (j = 0; (s1[i] != s2[j]) && s2[j] != '\0'; ++j) ; if (s2[j] == '\0') s1[k++] = s1[i]; } s1[k] = '\0'; }
Follow the visual explanation of this program in this post - https://www.learntosolveit.com/cprogramming/chapter2/ex_2.4_squeezess
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