Programming

#include <stdio.h>

int main(int argc, char *argv[]) {
    printf("%d\n", sizeof(argv[1]));
    return 0;
}

if(!strcmp(argv[1], "int")) 
    printf("%d\n", sizeof(int));
else if(!strcmp(argv[1], "double")
    printf("%d\n", sizeof(double));
else if(...)

const struct sizes_t
{
        const char *str;
        int size;
} sizes[]={
 { "char", sizeof(char) }, { "short", sizeof(short) }, { "int", sizeof(int) },
 { "long", sizeof(long) }, { NULL, 0 } };

int main(int argc, char *argv[])
{
        int n;
        for(n=0; sizes[n].str != NULL; n++)
        {
                if(strcmp(argv[1], sizes[n].str) == 0)
                {
                        printf("sizeof %s = %d\n", sizes[n].str, sizes[n].size);
                        break;
                }
        }
}