Create Compare Strings.c

Mrigank005 · web-flow · commit fdc036ac774b · 2025-05-03T05:29:34.000+05:30
diff --git a/String/Compare Strings.c b/String/Compare Strings.c
@@ -0,0 +1,46 @@
+ // C program to compare the two strings without using strcmp() function
+#include <stdio.h>
+#define str_size 100 // Declare the maximum size of the string
+
+// Function to compare two strings
+int test(char* s1, char* s2) {
+    int flag = 0; // Initialize a flag variable to indicate string equality or inequality
+
+    // Loop to compare characters in the strings until null terminator '\0' is found in both strings
+    while (*s1 != '\0' || *s2 != '\0') {
+        if (*s1 == *s2) { // Check if the characters in both strings are equal
+            s1++; // Move to the next character in the first string
+            s2++; // Move to the next character in the second string
+        } else if ((*s1 == '\0' && *s2 != '\0') || (*s1 != '\0' && *s2 == '\0') || *s1 != *s2) {
+            // Check for cases where one string ends before the other or characters at the same index are not equal
+            flag = 1; // Set the flag to indicate inequality
+            break; // Exit the loop as inequality is found
+        }
+    }
+    return flag; // Return the flag indicating string equality (0) or inequality (1)
+}
+
+// Main function
+int main(void) {
+    char str1[str_size], str2[str_size]; // Declare character arrays for the two strings
+    int flg = 0; // Initialize a flag variable
+
+    printf("\nInput the 1st string : ");
+    fgets(str1, sizeof str1, stdin); // Read the first string from the standard input (keyboard)
+    printf("Input the 2nd string : ");
+    fgets(str2, sizeof str2, stdin); // Read the second string from the standard input (keyboard)
+
+    printf("\nString1: %s", str1); // Display the first string
+    printf("String2: %s", str2); // Display the second string
+
+    flg = test(str1, str2); // Call the function to compare the strings
+
+    // Display the comparison result based on the flag value
+    if (flg == 0) {
+        printf("\nStrings are equal.\n");
+    } else if (flg == 1) {
+        printf("\nStrings are not equal.");
+    }
+
+    return 0; // Return 0 to indicate successful program execution
+}
