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Intey/main.c

Last active November 1, 2018 18:36
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  1. Intey revised this gist Nov 1, 2018. No changes.
  2. Intey created this gist Nov 1, 2018.
    105 changes: 105 additions & 0 deletions main.c
    View file
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,105 @@
    #include <stdio.h> // scanf, printf
    #include <math.h> // pow

    int slen(char* s) {
    int res = 0;
    while(*s) { res++; s++; }
    return res;
    }

    int fromBin(char* s) {
    int result = 0;
    int len = slen(s);
    for (int i = 0; i < len; ++i) {
    if (s[i] == '0') { }
    else if (s[i]== '1') {
    result += 1 * pow(2, len - i - 1);
    }
    else {
    return -1;
    }
    }
    return result;
    }

    int fromDec(char* s) {
    return 0;
    }

    int fromOct(char* s) {
    int result = 0;
    int len = 0;
    len = slen(s);
    for (int i = 0; i < len; ++i) {
    if (s[i] == '0') { }
    else if (s[i] == '1') {
    result += 1 * pow(8, len - i -1);
    }
    else if (s[i] == '2') {
    result += 2 * pow(8, len - i - 1);
    }
    else if (s[i] == '3') {
    result += 3 * pow(8, len - i - 1);
    }
    else if (s[i] == '4') {
    result += 4 * pow(8, len - i - 1);
    }
    else if (s[i] == '5') {
    result += 5 * pow(8, len - i - 1);
    }
    else if (s[i] == '6') {
    result += 6 * pow(8, len - i - 1);
    }
    else if (s[i] == '7') {
    result += 7 * pow(8, len - i - 1);
    }
    else {
    return -1;
    }
    }
    return result;
    }

    int main(int argc, char *argv[])
    {
    // +1 к длинне, чтобы считать \0 завершение строки, иначе массивы станут одим
    // целым
    int b = 0;
    char r[7];
    scanf("%d", &b);
    scanf("%6s", r);
    printf("%d %s\n", b, r);
    int v; // число в десятичной
    char* res; // результирующая строка
    if (b == 2) {
    v = fromBin(r);
    if (v < 0)
    {
    printf("number is wrong\n");
    return 0;
    }
    printf("%x \n", v);
    } else if (b == 8) {
    v = fromOct(r);
    if (v < 0)
    {
    printf("number is wrong\n");
    return 0;
    }
    printf("%x\n", v);
    }
    else if (b == 10 ) {
    v = fromDec(r);
    if (v < 0)
    {
    printf("number is wrong\n");
    return 0;
    }
    printf("%x\n", v);
    }
    else {
    res = "base is wrong";
    printf("%s \n", res);
    }
    return 0;
    }