# include <stdio.h>
main()
{
    int i, j, sum, smm;
    sum = 0;
    smm = 0;
   
    for(i = 1; i <= 100; i = i + 2 )
    sum = sum + i;
    printf("100之内奇数的值；%d\n", sum );
   
   
   
    for(j = 2; j <= 100; i = i + 2 )
    smm = smm + j;
    printf("100之内偶数的值；%d\n", smm);

   
   
}

#include <stdio.h>
int main()
{
    int i, sum, smm;
    sum = 0;
    smm = 0;
   
    for(i = 1; i <= 100; i++)
        if(i%2==1)
            sum = sum + i;
        else
            smm = smm + i;
    printf("100之内奇数的值；%d\n", sum );
    printf("100之内偶数的值；%d\n", smm);

    return 0;
   
}

第二个循环应j+=2了

楼主，你的代码，第二个循环条件 j=j+2  误写成 i=i+2