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Here's a simple implementation of strcmp function of string library.
It returns -1 if the first string is less than second , 1 if second string is less than first and 0 if the strings are equal.
It returns -1 if the first string is less than second , 1 if second string is less than first and 0 if the strings are equal.
#include<stdio.h> #include<stdlib.h> int main() { char *string1,*string2; //variables to store inputs to be compared int ret; //variable to collect return value char *temp1,*temp2; /*function prototype it takes strings to be compared and returns value accordingly*/ int my_strcmp(const char *temp1,const char *temp2); string1=(char*)malloc(20); string2=(char*)malloc(20); temp1=string1; temp2=string2; printf("enter two strings to be compared :\n"); temp1=string1; temp2=string2; fgets(string1,20,stdin); //taking input from user fflush(stdin); fgets(string2,20,stdin); //taking input from user while(*temp1) { temp1++; } temp1--; if(*temp1=='\n') { *temp1='\0'; } while(*temp2) { temp2++; } temp2--; if(*temp2=='\n') { *temp2='\0'; } ret=my_strcmp(string1,string2); printf("\nthe return value is %d\n",ret); free(string1); free(string2); return EXIT_SUCCESS; } int my_strcmp(const char *temp1,const char *temp2) { while(*temp1 && *temp2) { if(*temp1==*temp2) { temp1++; temp2++; } else { if(*temp1<*temp2) { return -1; //returning a negative value } else { return 1; //returning a positive value } } } return 0; //return 0 when strings are same }
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