If your loop has the following form…
    «INIT»
    while(«CONDITION») {
        «BODY»
        «NEXT»
    }

… then use a for loop instead.
    for(«INIT», «CONDITION», «NEXT») {
        «BODY»
    }

That for loop is equivalent to the while loop before.

∙ «INIT» is executed only once.
∙ «CONDITION» is always checked before «BODY» is executed.
∙ «NEXT» is executed immediately after «BODY»

Example
 1. «INIT»
 2. Check «CONDITION».  It is true, so proceed.
 3. «BODY»
 4. «NEXT»
 5. Check «CONDITION».  It is true, so proceed.
 6. «BODY»
 7. «NEXT»
 8. Check «CONDITION».  It is false so stop.

That normally occurs when iterating through an array, string, or linked list.

EXAMPLE #1:  Array of int
    // OLD
    int numbers[] = { 1, 2, 3 };
    int i = 0;
    while(i < 3) {
        printf("numbers[%d] == %d\n", i, numbers[i]);
        i++;
    }

    // GOOD
    int numbers[] = { 1, 2, 3 };
    for(int i = 0; i < 3; i++) {
        printf("numbers[%d] == %d\n", i, numbers[i]);
    }

EXAMPLE #2:  Linked list
    // OLD
    Node* curr = head;
    while(curr != NULL) {
        printf("curr -> value == %d\n", curr -> value);
        curr = curr -> next;
    }

    // GOOD
    for(Node* curr = head; curr != NULL; curr = curr -> next) {
        printf("curr -> value == %d\n", curr -> value);
    }

EXAMPLE #3:  File

    // OLD
    FILE* fp = fopen("…", "r");
    char ch = fgetc(fp);
    while(!feof(fp)) {
        fputc(ch, stdout);
        ch = fgetc(fp);
    }

    // GOOD
    FILE* fp = fopen("…", "r");
    for(char ch = fgetc(fp); !feof(fp), ch = fgetc(fp)) {
        fputc(ch, stdout);
    }

EXAMPLE #4:  String
    // OLD
    char s[] = "abc";
    int i = 0;
    while(s[i] != '\0') {
        fputc(s[i], stdout);
        i++;
    }

    // GOOD
    char s[] = "abc";
    for(int i = 0; s[i] != '\0'; i++) {
        fputc(s[i], stdout);
    }