Create 4. string check if it has a sub string.c

LabRecord/4. string check if it has a sub string.c

@@ -0,0 +1,27 @@
+#include <stdio.h>
+#include <string.h>
+
+
+int main() {
+    char str[100], substr[100];
+
+    printf("Enter your main string : ");
+    scanf("%s",str);
+    printf("Enter your sub string : ");
+    scanf("%s",substr);
+
+    int len = strlen(str), sublen = strlen(substr), flag = 0, sup =0;
+
+    for(int i = 0;i<=len-sublen;i++){
+        if (strncmp(str + i, substr, sublen) == 0) { // strncmp(str1, str2, times to check)
+            flag = 1;
+            sup = i;
+        }
+    }
+    if(flag ==1){
+        printf("Sub string found at %d",sup);
+    }
+    else{
+        printf("Sub string not found");
+    }
+}