CIntermediate

C Arrays & Strings

Work with arrays and strings in C: declare arrays, loop over elements, measure string length, and compare strings with string.h.

01Arrays

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main.c

#include <stdio.h>

int main() {
    int nums[5] = {10, 20, 30, 40, 50};
    printf("%d\n", nums[0]);
    printf("%d\n", nums[4]);
    return 0;
}

Output

10
50

02Loop over an array

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main.c

#include <stdio.h>

int main() {
    int nums[4] = {2, 4, 6, 8};
    int sum = 0;
    for (int i = 0; i < 4; i++) sum += nums[i];
    printf("Sum = %d\n", sum);
    return 0;
}

Output

Sum = 20

03String length

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main.c

#include <stdio.h>
#include <string.h>

int main() {
    char name[] = "Python";
    printf("Length: %lu\n", strlen(name));
    printf("%s\n", name);
    return 0;
}

Output

Length: 6
Python

04Compare strings

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main.c

#include <stdio.h>
#include <string.h>

int main() {
    char a[] = "cat";
    char b[] = "cat";
    if (strcmp(a, b) == 0) printf("Equal\n");
    else printf("Different\n");
    return 0;
}

Output

Equal